My only regret, much to the despair of capital punishment opposition, is two-fold:
1) It took 7 years to finally execute this human detritus
2) He wasn't beaten to within an inch of his life and then given a slow-drip IV of Clorox. Lethal injection was too mild- an injection of Twinkie filling comes to mind.
People at the execution were showing all kinds of emotion and some just wanted him to take responsibility for his actions and show a little regret. I think that is too much to ask from someone who takes the time to mastermind and carry out a sniping spree. Why did he do it? Because he is a crazy, psychotic fuck head. Most people who carry out these types of crimes fall into this category.
Psychologists and other soft science practitioners will try to find out why people commit senseless crimes like this, but they never will. Social neglect, depression, getting felt up by that creepy Unlce will all be reasons that surface but I don't think any of them are the reason. I honestly believe it has something to do with the evil that penetrates a lost soul and consumes them.