Bruh, William's entire character is all about control. Everything he has done so far is all in the name of control, from trying to dictate his kids' lives (until he could no longer with Alex so he disowns her instead) to trying to wrest control of Ulysses from the Founder. So why, pray tell, would a man with such a character suddenly decide to murder 600,000 players in a non-discrete fashion and thus send the company he has tried so hard to control in complete freefall?
And William with the Syndicate? Really? A person who's a control freak associating himself with a group that seeks to break the chains of Eternum and therefore deny people like him any sort of control over it? Are you serious?