That’s the Bush doctrine! A belief that you can invade a country, remove the power center, and democracy will spring forth. You don’t even need to speak the local language, read any books about the country you’re attacking, or talk to any locals! Just go for it and democracy will magically spring into existence.

What else does "regime change" as a goal refer to?

Not directly but OP seemed to intuit some sort of moral justification for this war of aggression ("humanitarian reasons"), and few people believe that to be a key motivating factor for the White House.