In a postmodern sense, the text is separate to the author, and can be meritorious even if the author is a despicable character. An artist of a comic book I read was removed from drawing because of domestic violence he had committed, but his art is not less well executed because of it.
A slightly different example would be the Emperor Marcus Aurelius, who was responsible for some fairly serious persecutions (against Christians), but whose philosophy (ironically very in line with Christian values) is still valuable and worth reading, despite the fact that I don't approve of him putting people to death.
On the other hand, fiscally supporting people or causes I'm morally opposed to really grates me the wrong way. I have made a choice to read none of Orson Scott Card's novels, despite loving Ender's Game, as since reading that I learned that not only has he been outspoken against muslims (in some pretty harmful comments), but also donates money to anti-gay organisations (and personally took part in opposing gay marriage in America). The idea that my purchases would fund propaganda against gay people was enough to stop me contributing money there, even though I have heard his books elegantly defended not only on their own merits, but also as tenderly showing views of acceptance and understanding between people, a value Scott-Card does not seem to show himself anymore.
Or: It's not enough to make me hate a book, but it's enough to make me hesitate and really consider what I'm reading.
Was that Rat Queens, with the artist on DV charges? I was disapointed to hear about that but I still loved the book and I have pre-ordered the next one. The writer and others involved with it aren't to blame for what he did so I hope they don't suffer financially for it. It's a pity about Orson Scott Card too. I also enjoyed Ender's Game, having read it way back before I'd heard about any of that.
Yeah it was Rat Queens. So sad because the book was amazing fun, but you're right that it's not right to punish the other creatives involved.
Orson Scott Card apparently started out as pretty nice, and grew insane over years. It seemed 9/11 affected him pretty deeply, and have encouraged certain anti-muslim talks.