The more interesting question is: what do we do with the art of people who were revealed to be terrible? I first saw people wrestle with this idea for Michael Jackson and recently it has been a big issue related to Kanye West.
https://en.wikipedia.org/wiki/Cat_Stevens%27_comments_about_...
More than anything, Islam seems ill equipped to handle these matters. And to be fair, he indicated he is not the guy to come to for this topic.
I would bolster that to say that if someone truly wanted a substantive, educated opinion about fatwa, they would have gone to someone capable of giving them that.
Great TV factual, devilish, host led open panel discussion about hair trigger dilemmas of real life and law staged by an international QC (now KC) and human rights lawyer.
It was literally about exploring the gap between written law, law as practicied, morals and ethics, and circumstances that would test anyone.
Cat Stevens / Yusuf Islam was a typical guest .. an everyman of no particular deep study into such things, just one of many on the Clapham omnibus.
Taking anything said by anyone on that particular show, sans context, as a literal statement of their core personal belief is tenuous at best.
Good show concept though, pity it's not around anymore: https://en.wikipedia.org/wiki/Geoffrey_Robertson#Media_caree...