[Defensewins]

Spazzing out is the problem.
We are talking about adults acting like children.
All of these terrible situations and few others not mentioned could have easily been avoided if calmer heads had prevailed. Tiger Woods and the Chris Henry situation were confrontations that escalated out of control. Tiger is lucky he did not get hurt more seriously.
Rather than two adults walking away from a heated confrontation with each other and waiting until both are calm enough to deal with the situation, instead confrontation that leads to violence takes place and escalates.
I think it speaks more to the culture of violence and macho one upsmanship.
'You cheated on me so I am going hit on the head with a golf club.' and potentially kill you.
Somewhere along the line a person puts their pride ahead of someones life.