I also don't think our "payment" as you put it was sufficient to offset the ongoing costs post WW2. My take was these costs are now no longer worth it and we should let Europe stand for Europe.
So, no, we're not going to, in your own words, "compare them to WW1 and WW2 and see if we owe you any money".
Moreover, the US were paid back for any weapons or resources you supplied.
Now, about that article 5. You were saying?
But instead of admitting that, you just crap on the sacrifices of hundreds of thousands who went across an ocean to help the people on a continent that 99% of them had never set foot in. Americans know how much you look down on them, and are finally responding accordingly.
Pay for your own defense. Good luck getting your citizens to give up the cushy welfare programs you'll have to give up to pay for weapons for the first time in generations.