Weighing in here
Adam was never the beast in Blake's story. He was first the cursed rose then he was Gaston ever since volume 3.
It's perfectly clear in that regard. Trying to salvage what is essentially a broken and evil character with some justification because he has a slight backstory is just lame. He was evil through and through and it looks like it didn't take much to turn him into that.
Should Winter go and start hurting people because Jacques was probably a douche to her at some point? Should Weiss turn into a serial killer because her face was branded with her father's hand mark?
Characters still have a choice and Adam chose the dark path. He is in by no means redeemed. He killed innocents and wanted to slaughter all of humanity.
Adam is dead now so let's end the discourse and put this to rest. If you want to enjoy Adam as a character do so, but don't try to glorify him or claim he's "bi" or try to argue his case in posts. You don't know enough of what you're talking about.
There small rant over sigh