Why do some men kill their women when they find them sleeping with other men?

ManHater
I never understood this but if your girl is bringing over men to fuck behind your back when you are at work. Then why do some men just simply kill their women? I mean it's like the ultimate betrayal in all sense.

I mean in Islam if you found your girl sleeping with other men you could kill her out right even have her stoned to death. I mean that's where it's at right? The threat of death for cheating is a pretty good deterrent no?
Why do some men kill their women when they find them sleeping with other men?
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