Vox Day ...

.
... has it exactly right:

Good for him. I wouldn't have any problem with his actions if he had killed both women after they were "incapacitated". Police commit "justifiable homicide" in far less dangerous circumstances all the time and are infamous for firing dozens of shots after their target is already down. It's simply not always possible to turn off the adrenaline-fueled aggression, particularly if you aren't sufficiently accustomed to experiencing it.

And more importantly, once you attack someone unprovoked, all bets are off and you merit no protection from the law. The fact that the attackers were women is irrelevant, a two-on-one attack absolutely merited such a vigorous response.

This regarding the incident where a McDonald's employee beat two customers senseless when they jumped over the counter and attacked him. I guess they had no idea that the employee is an ex-con, and that he probably knows a thing or two about dealing with aggressors.

This is my main reason I don't try to carry less-than-lethal products like Sebastian does - once an attack has been started by someone else, it is incumbent on you to end it. When someone invades your personal space, your hand should go to your handgun, not your pepper spray.

pm