As others have stated, this is a freedom of speech issue as much as anything here, whilst people (depending on your point of view) rightly or wrongly hate the far right for their beliefs and often site the NAZI’s for this (although there are also other examples), the far left is just as bad, with Mao, Stalin, Pol-Pot not to mention all the “left” states created by the Soviets post WWII which have far higher bodycounts and incited even more hatred against those they did not like.

You are providing a piece of software, granted it’s free, but how about keeping politics, and specifically your political beliefs out of it. If you want to put in music filtering, thats fine, but allow the user to put in tags that they want filtered out, not just what you want them to filter out. Then the users can decide what they want.