My friend beat up the guy his wife cheated with on him, was it worth it?

My friend went out of control yesterday and waired for the guy at his school ( he is 18) and he kicked his butt pretty badly. His mom pressed charges since she witnessed everything and my friend spent a night in jail. I wonder now whether it was all worth it.

He is 28 and the guy is now in hospital. He told me he kicked him in the head and he started bleeding. I think that kid deserved it. What do you think?
My friend beat up the guy his wife cheated with on him, was it worth it?
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