You Know I Couldn’t Last

It was one of her tweets, it's on wikipedia and was widely "reported" at the time. It came in the context of her late conversion to Islam, and the blowback it generated (imagine being a high-profile personality in a deeply $religion-following country, and publicly abiuring that to become $aVeryDifferentReligion...).

Sinead O'Connor was a very successful singer who, arguably at the apex of her artistic success, engineered an anti-Catholic stunt on US television that effectively killed her career (even though it turned out, less than a decade later, that she was actually right).

She then struggled with personal problems of various nature, always remaining fiercely outspoken on pretty much any political subject you can imagine, and a bit of a contrarian (she recently converted to Islam). She was largely ostracised by the entertainment industry until the very end.

Morrissey is the former singer for The Smiths. He has exposed fairly controversial views, who many would call deeply racist, and was hence similarly "firewalled" by the mainstream industry - although arguably not to the level of O'Connor (probably because his fanbase has always been bigger, or because he's an English man living in LA rather than an Irish woman living in Ireland). He has always had a penchant for being a contrarian and attacking what he sees as hypocrisy in the mainstream. The death of O'Connor gave him a chance so big he couldn't pass it on.