"If you go through security 4 times a day you are on short haul flights. I tend to fly in increments of 2500 miles." You shouldn't presume to know anything at all about whether I fly SH or LH from the statement I made about passing through security up to 4 times a day. I'm on what is called a medium haul fleet - we fly both long and short haul flights. My flight tomorrow will be over 10 hours long. My flights last week were 55 minutes each.
Security are within their rights to open EVERYTHING YOU HAVE. And if you tell them to go fuck themselves, they probably will open everything you have. I think you are actually quite lucky they didn't ask you into a side room whilst putting on their rubber gloves! I suspect that the Danish lady you were abusive to was far more laid back than a typical TSA operative would have been - I'd love to be a fly on the wall if you told a JFK security staff member to go fuck themselves! I suspect I'd hear the fallout on the other side of the Atlantic.
I have no experience at all with flying on SAS. It would seem from what you write that they are a terrible airline to travel with. I'd be thinking about travelling with someone else in the future! If you have genuinely paid for 2 business seats and are moved into one economy seat you have a very valid case for compensation against the airline. From your post they seem rather bad with delays too. Which is a puzzle to me as SAS have a reputation as being one of the most punctual airlines in Europe.
It does also seem to me though that perhaps your baby isn't really ready to be a frequent flyer. She seems quite high-needs, and perhaps it would be kinder all round if you maybe waited till life was a little easier to be making so many long flights? I know sometimes I find it tiresome, and I get paid to do it!
As for airlines putting nappies on all flights - there simply isn't the room. As parents of children we are expected to be able to make provision for them while we travel. It is not an unexpected occurrence for a baby to need a clean nappy putting on during a flight. It could well be unexpected (and embarrassing) for someone to suddenly need sanitary protection. Only a small number of basic items are generally stocked, and they take up very little room. But if airlines were to stock nappies - how many would you supply? And what sizes? You would get passengers not taking nappies because they expect the airlines to provide them, only to find that someone has pinched the lot of them because it beats buying them once they get to their destination. Then there would be more complaints!
Far better to expect parents to do their jobs and ensure they have packed enough nappies. I appreciate you packed enough, but somehow failed to notice you had left most of them at security, but the airlines can't be held responsible for what you do at security. I am surprised that you felt so rushed though - having got to the airport 3 hours before your flight (which is not a mandatory requirement, btw. Heathrow has some of the strictest security conformance procedures in the world, yet only requires you to present yourself at the airport 40 mins before the flight, and to be at security 35 mins before it.) I've been to Copenhagen many times, and it's large, but not enormous in the way that eg Washington or Rome are.
I would be winding my neck in if I were you, as you sound peculiarly inexperienced for someone who protests how much they fly, and every time you post you make yourself sound a bit more precious. How DID you manage to be 4 months pregnant with an 11 month old, btw?