After over 3 decades of voting, across 3 countries, even having held beliefs all the way from what I though was "communism" (when I was little more than a kid) through neoliberalism and finally settling down to a sort of social democracy (shaped by and subservient to my principles) and having even been involved in a supposedly thinking leftwing party around here I would stay that mindless tribalism is exactly what almost the entirety of politics is nowadays.

The whole "building your on political beliefs starting from your core principles upwards, and always keeping them in mind" thing is very unusually: normally (even in that supposedly "thinking" people party) it's all about choosing sides, growing an emotional bond with your side and then just blindly waving the team's flag and unskeptically take in and parrot whatever your side's celebrities says as if they're unchallangeable truths delivered down all the way from the gods.

In fact I'm pretty pissed from discovering that most people in even that party of supposedly thinking people are little more than clubist political parrots. It does however explain why so many measures people parrot as the right thing to do are actually one-sided and in practice not anchored in the principles we're told they're suppose to promote, sometime even de facto going against them: when people are unskeptical unthinking fans of the team, they're really easy to lead by the nose by womever captures the leadership positions on that team, an sometimes said leaders aren't even purposefully manipulative, they're just nowere as bright as their small-pond celebrity status makes them think and generally have ridiculously narrow life experience and hence don't really know much about how the World works outside their tiny tiny bubble.