Well, but that's the point Inga. We aren't wolves. We're human beings.
Any pencil neck dweeb can take out the baddest man on the planet with relative ease if he really felt like it. Choosing to let things go doesn't make one a coward. It just means a person recognizes the value of living in a civil society and is willing to abide by the norms of a social contract that makes that civil society work.
All internet forum BS aside, I'm not entirely convinced you'd be happy to see your husband rot in prison just because one random night some random guy slapped your ass.
On a related note, if we're really going down the "cuck" road, I'm willing to bet that a murder sentence is the more sure path to having someone else fuck your wife than walking away when some asshole acts like an asshole.