I believe that what someone does during their private time should have no impact whatsoever on their employment. Unless of course the impacts of what they do mean they cannot do the job, such as landing in prison.
The fact that what one does during their private time, even when it doesn't affect ability to do their job, may be grounds for dismissal is simply a reflection of our subservience to corporate interests.
The issue I have with Chapman is primarily the shooting up of his garage after an argument is emotional abuse, just a step below holding a gun to his womans head. Anyone who doesn't think emotional abuse is as bad as physical abuse should educate themselves. It can be worse.