OK here's my take... most (yet not all) artists that are politically outspoken lack empirical and theoretical knowledge in subjects like history, geopolitics, economics and so forth. When they express their opinion, then it's nothing else but emotions (usually diatribe). You better be careful if you are on the spotlight.
Agreed. Their poor education and lack of intelligent insight on anything of substance means that the only thing they can bring themselves to talk about is pop culture and their garbage liberal views that have been spoon-fed to them. They don't vacation in Europe to see the art museums, the countryside, or to admire the architecture. It's just a different setting to drink and get high in.