I disagree, Chuck. If the guy is significantly bigger than I am (very likely) I don't want to trade well executed blows with him. I want him down fast. And I want him to stay there so I have adequate time to get away. If I merely flip him he can get back up and attack me again.
If someone is holding a gun to my head (one of the things Krav Maga deals with) I'm not going to feel the least bit sorry I broke his wrist, elbow or knee. I'm not concerned with anyone judging me if I maim the guy. I'm worried about my possible rape or death.
This isn't for points, this isn't for self esteem, this is for self preservation.
It isn't too extreme to be effective. It is effective because it is extreme.