Mr. Hyde had split personalities. One personality cannot be both, at the same time. That would cause a paradox, and the Hero Villain would implode, trying to destroy himself.

Being good has it's benefits, as in people trust you, etc. but bad also has merits, i.e. not having to follow the rules about something.

Therefore, it is best to be good when it suits the company you are keeping, and bad when you want to get something done fast.

Unfortunately, this wasn't an option... *facepalm*