I do believe there is some truth to this in relation to some violent people in general.
I bet there’s a real correlation between domestic violence and homosexuality in homophobes in denial. I don’t know if any proper studies have ever been done on that, but I bet it’s true. There will undoubtedly be a number of old football hooligans that this applies to.
But it’s certainly not just this.
Violence is an insecurity problem for many people.
For others, fighting is a form of self harm - that same release is felt when they get punched in the face or kneed in the ribs is the same that others feel when they cut their arms with a razor blade or whip their backs with a belt.
Some people are sadistic and enjoy giving and receiving pain. Some people are utter evil cunts!
For others, they simply love a good scrap. It’s exciting, it’s a rush!
Humans are a naturally violent species and across the spectrum of society many will have many reasons (consciously or subconsciously) for why they enjoy or partake in violence.