Yes I agree it's getting very, very silly.
As I commented above:
It's all in the preparation! Your DD was ok. Yes it's worrying, but as long as it was ok, it's ok.
The important thing here is that your DH comes to understand and accept that it was wrong, that anything could have happened, and it shouldn't be repeated. Perhaps having a "furious" conversation isn't the best way to achieve that.
I have repeatedly said it's not desirable!
In my case, my DD was on her own. She was unwell with a high temperature and was watching Cbeebies tucked in on the sofa. We had a chat about how I had to go out if she wanted milk, I made sure she didn't need to go to the loo, she knew where I was going, I told her she must stay where she is and not answer the door or the phone. She understood, and I was satisfied that she understood.
It wasn't ideal and I bust a gut getting back worrying that the house might have burned down or she had had a fit or something, but she was fine.
It happens.
The important thing is to make sure that as far as possible it doesn't happen again. Flying off the handle is probably not the best way to achieve that.
Anyway, goodnight all!