Enable much? What was his excuse for doing the same things at Nebraska? Shouldn't he have learned his lesson and matured after he was kicked off that team.
The risk to signing a guy like this is every time you preach you're building a physical, tough, smart football team and then you bring in a guy who isn't one of those things or a locker room malcontent, your message gets a little more hollow.
Whether you have a WR who is the antithesis of "tough" or an G who is the opposite of "smart", keeping these guys on the team or bringing them in new looks like double speak. It won't take long for this guy to make a stupid penalty that may or may not cost a game and he come over to the sideline and won't like Tony getting in his face. It's his MO, it's what he does.
The guy has great strength and power. If you sign him to a conditional low $ contract, the dollar risk is low, but don't ignore the locker room risk.