To think DH did nothing wrong here?

The very purpose of a warning triangle is to.... Warn people. A car with hazards on is an obstacle. I can't believe I'm actually having to explain this.

Well quite, but I honestly think some people just don’t think things through when they’re in a bit of a panic.

A car with its hazards on will attract approaching motorists’ attention, so they’ll be concentrating on the situation as they approach. Plus, they’ll likely reduce their speed, which further reduces the risk to the broken-down vehicle. Sure, a warning triangle might be preferable, but DH’s action was still very useful. It may also be that he was going to flag down or otherwise warn drivers as they approached.

Sounds more like a frightened woman was further frightened by a bloke turning up when she was vulnerable and saying

'I can stay with you' - um, no. 'In my car' - not getting in your car with you.

'You can come back to my house, I'm just around the corner' - no.

'You can stand in my driveway' - still not going with you to your house.

'My wife asked me to help you' - how do I know that? You could have seen me here and decided to take the opportunity.

'This is my name and address' - does that make getting in your car as a strange man inviting me back to your house any safer when it could easily be a false name and address?

Just because he meant 'I'm going to rescue you and although you haven't a scooby whether I'm doing this for altruistic reasons or so you feature in a documentary in nine years about how you disappeared from a broken down vehicle and was never seen again but a piece of paper with a false name and address was found at the scene, I'm definitely doing this because I'm a latter day Knightrider' doesn't mean that she was going to instinctively know that going against everything women learn about how dangerous men can be would be fine on this occasion.

All the advice for women in the event of a breakdown that isn't on a motorway is to stay in the car, to not accept help from strangers (specifically men) and to report if somebody (specifically men) make you feel uncomfortable. And that a genuinely benign person - man - won't be offended.

Don't be silly, a warning triangle means "problem ahead".

A car with its hazards on looks like it is the problem.

I think all men should be aware how their actions may be interpreted by women. He knows he was trying to help, but she didn't know that. If she lets him help and all is well, next time - with not such a nice bloke - her guard may be down.
FWIW, I would be creeped out if some random guy was sitting in a car behind me in the dark.
The obvious thing was to get the husband to do the school run, as they were so close to OP's home, or call the police.

If the woman had put out a warning triangle, motorists would have had to go around that too. Negotiating two obstacles which you are aware of is far preferable to colliding with one that you didn’t see until it was too late. I can’t believe I’m actually having to explain this.

By putting another obstacle for people to have to go round, just before a bend. People will think they have gone round the obstacle, not expecting another one just up ahead. Or be on the wrong side of the road, with other cars heading towards them.

If he had put a warning triangle, people look ahead for an obstacle.

The woman in question was a bit pathetic though. She was sitting in the dark causing a hazard like a gormless idiot. So, yes the man in question did know what was best for this woman because he was trying to avoid other road users killing themselves and her due to her completely incompetent behaviour.

How did the DH “add to the hazards” of the situation? He did what is a legal requirement in many countries, which is to provide advance warning of the concealed, broken-down vehicle to other vehicles approaching the scene.

Presumably you are capable of following the guidance on what to do if you break down so that you reduce the danger to yourself and other road users. This woman was not capable of that so someone needed to do the thinking for her.

A dangerous obstruction on the road is a police matter. They should have been called to attend and control traffic as required until the vehicle was recovered.

Your husband tried to do a good deed. Good for him.

The woman, in an already potentially stressful situation, wasn't sure whether your husband was doing a good deed or was potentially predatory. She was right to call the police

The police came and checked it out. They weren't to know your husband wasn't predatory until they had.

How about no-one was unreasonable and no-one was hurt and it all ended well?

Well apparently the grown adult couldn't manage to think for herself. She sat in a broken down car, in the dark, on a blind bend causing a hazard for every other road user. So yeah, someone needed to take control because she was being an idiot.

Yes.
Also, it needs to be, given the state of this world we didn't choose to live in.

How is he supposed to be capable of harming her when he is sitting on the other side of the blind bend, in his car, with his hazard lights on?

This woman sounds incredibly stupid, but kudos to your husband for trying to help her. 👍

Her DH had just been told a driver had put his DW and DC at risk and nearly had a dangerous collision with and was continuing to be a danger to herself and more importantly to others.
So yes, pathetic little woman sums her up quite well. Her wish to be a danger to others isn't o arriving because she's a poor little woman.

How is she supposed to know what he's saying and doing is genuine? She's not a mind reader.

Exactly.

The good men need to really start to understand this.

Except she actually was being silly to refuse the help provided, and he and his wife, who know the road and how people drive along it, did know best…

To be honest, I’m more scared of your lack of critical thinking skills and hyperbole, but you do you.

Absolute bullshit. What’s creepy about preventing accidents?