You may be right, I don't like autocratic rulers for life either, and I think a majority in the US and NATO agree with that very sentiment.

However note how aggressive a stance that is. NATO is supposed to be a defensive organization but with the charter/purpose you suggest, it is rational for Putin and Xi to fear US/NATO aggression and do whatever it takes to fight its expansion. It is very much a threat to their survival, and the existence of their countries as they know it.