I've read and enjoyed incestfic (het and slash). That doesn't mean I want to shag my brother.
I've read and enjoyed, and currently have a bunny for chanslash (undeage slash). That doesn't mean I think all adult/teenager relatoinships are completely equal and healthy.
I'm working on an IRA!AU. I do not think terrorism is good.
I've also read watersports, scat, necrophilia, and all kins of things that require warnings. I'm notoriously unsquickable by content. Pairing, sometimes, because I'm prone to character issues, and some characterisatoins, and unhealthy relationships portrayed as romatic rub me the wrong way, but you know, it's fiction. I have a back button, and a delete button, and I have no qualks about writing to someone if I'm truly bothered saying "Look, I think this is terrible OOC" and stuff.
But I'm not gonna judge people on what they read or write. Because I've been reading incest porn and hardcore S&M and rape porn and all kinds of wrong since I was fourteen, and I have yet to shag my brothers, or rape someone, or what have you.
We are not our stories.