Not blaming the USA for withdrawing from NATO - should it occur - misses the point of NATO entirely: it's in the West's interest and of every Democratic nation, to ensure that aggressor nations will not invade free societies. Without NATO, the risk is that all Democratic nations will fall, one by one, to aggressor nations - worst case - or - best case - some terrible war breaks out causing millions and millions of deaths.
So go ahead - don't blame the USA if it withdraws from NATO for "financial reasons" - I, on the other hand, will blame the USA for any wars that consequently result.