I imagine they did after the Second World War and the Marshall Plan.

Maybe they did during the Cold War, but Nato was mutually beneficial. Finland and Sweden were both neutral then, and the USSR didn’t try to invade them (it did invade Finland during the Second World War). Norway could have remained neutral too.

Today, Nato mostly just causes problems. European politicians and people in Europe who are obsessed with Ukraine are no different from the prior administration and Democrats/Neocons in the US.