There is a kind of difference between democracies. While I can see the importance of supporting democracy, that does not mean the same thing everywhere. So to give one example I can see the importance of defending Taiwan. Some might object because of the USA involvment in Vietnam. But that is not the same thing as defending South Vietnam. (It was about as a corrupt democracy as one could imagine. Thar is exactly why many people in South Vietnam supported the North.) Others might object to the USA involvment in Afghanistan. But defending Taiwan is not same thing as trying to create a Democracy in Afghanistan.
[ I am referring to the problem that China seems intend on conquering Taiwan like it did Hong Kong. What is it that I have against Communism? It is that not everyone that claims to be exploited has been exploited. Some have and some have not. If you attribute validity to anyone who claims to have been exploited, you end up with the way the USA is becoming nowadays.]