Where do you draw the line? It's a personal thing because music should be a pleasurable, spiritual, enjoyable or transcendental thing - if not all four. If there is something biting away, the meaning is thwarted IMO.
One of my favourite genres - metal - at the black, atmospheric, folk end of things has a number of artists who quite frankly are dodgy as f==k for the things they believe in. Despite many denials to the contrary from such bands, I've largely given up on some of these artists because of what they believe in, but this is a personal barrier and I wouldn't have a problem with anyone I knew (with a similar outlook on life as me) seeing it differently. Because many of them are not commercial, they are beneath the radar but influential within their own scene. (There's the usual bands within extreme metal with their shock-horror satanic imagery and lyrics but IMO they'd be better off burying themselves within the higher echelons of the Church of England if they're truly sincere about their distaste for humanity).
Burzum are one example, Drudkh are another. Musically, I like them both, politically no way. A shame they had to bring that dimension in on their artwork. Burzum is a one-man project by a guy who is a known white-supremacist and despite the fact his music isn't used to convey his screwed up opinions, the fact I know he is, alters my enjoyment of his music end of. Drudkh are a Ukrainian Black Metal outfit who deny being nazis but allay themselves with Ukrainian ultra-nationalism - nice, think I'll steer clear when there are so many similar sounding bands that keep politics out of their work in that genre, and for good reason.
In short I wouldn't buy their music but it does make me think where you draw the line? These guys, whatever they believe, are not IMO anywhere near as sick as this Watkins individual and when you think about it, what about the casual misogyny of gangster rappers? Commercial and mainstream so okay? I don't think so but again that's my choice. And again so too is a rejection of so much commercial music given that the industry is run and exercised by money and image-obsessed poseurs, those so far stuck up their own peanuts they perhaps should think about something worthwhile to say or do, or not say or do anything at all.