Well let’s unpick that a little since you ask.
why should trump/ america support nato.
Perhaps because they signed up to Nato recognising that it might just help them out too. That’s what honourable countries do, but Trump is not an honourable person so he is threatening to default on his country’s promise.
You might say that whoever signed up should not have done, in which case there is a proper way to retire from membership, but slinging all kinds of insults as Trump does is not the right way to go about it.
they have paid billions a year into it then have to sort out the europeans time and time again.
Yet when they call on europe to help them (911 afghanistan syria etc) they are shown two fingers pretty much.
Yes it has cost them money, but who said in the first place that it was going to be cheap, and they have the largest economy so it seems only right that they should pay accordingly.
As far as helping out time and again goes, I suppose you are referring to 2 world wars. Well, they did help out from the start with money (loaned to Britain btw, we only finished the last payment in 2003) and material but, quite sensibly in my view, they did not jump in with both feet like Britain (not sensibly, by which I mean we shouldn’t have promised in the first place) did in spite of being unprepared, but waited, building up war production until they were attacked themselves, in both wars.
Who showed 2 fingers? Certainly not Britain, she was on the coat tails of Bush right away. France refused, thank you Jacko, to join in an illegal war which was pursued even after the pretence for it disappeared, the death of Bin Laden
But Trump has got one thing right, and some European countries to their credit are putting it right, Poland, Denmark etc., more should be spent on defence. If that was done we wouldn’t need the clown, Russia has already proved it is a paper tiger, a so called super power that can’t subdue a much smaller neighbour after 3 years of trying, if it is stopped there it certainly can’t go further against Nato in Europe. It is a super power only because of its nuclear status, and, however small, there are 2 nuclear powers in Europe against it.