Why does philosophy, dealing with such apparently abstract issues, generate so many controversies?  Because philosophy is essentially debating what counts as a publicly admissible reason as a ground for persuasion and governance.  It essentially discusses what is free game (or a personal preference beyond law) and what is binding or public. Philosophy is meta-politics, or the question of what can count as a reason, whether there are any reasons, who ought to be authorized to speak, whether everyone should be authorized, etc. It explores the boundary between reasons and violence (tyrannical imposition) and is politics before politics.