He was arrested for at least 1 crime using a gun already.  Personally, I think that should have been enough to keep him from owning guns again.  If we as gun owners want to keep that right, we need to be good with laws restricting people who commit crimes with guns from legally owning them.

http://www.denverpost.com/2017/06/14/steve-scalise-gunman-history-arrests/

"In 2006, he was arrested on a battery charge after allegedly punching a woman in the face, then striking her boyfriend in the head with the wooden stock of a 12-guage shotgun before firing a round at the man, according to a sheriff’s department report."