Political issues are generally those that many people, or powerful people, care strongly and disagree about.

At LW we discuss mostly issues that most people don't understand, know about, or care about. That's the only reason they are not "political". Suppose someone builds an AGI and it changes the world. Everyone will suddenly care about FAI, AI ethics, etc. The issues will become highly politicized and no doubt strong mind-killers for most people who talk about them. But I wouldn't want LW to then stop talking about those issues.