hot take; the closest the WH40K universe gets to good guys are *orks*. Literally every other faction is racist AF and the Imperium in particular adds vivisection, brutal classism and backwards fundamentalism. Orks just want to hit you, preferably as loud/fast as possible, and take your stuff.
@LexYeen here, have the most Orky song The Clash ever wrote
@Leucrotta da boyz jus' wanna have fun, ya git