For career, that is repeat offenders--I differentiate here. Someone who committed multiple felonies all at once is a different case from someone who committed one or more, got out committed more, got out committed more. It's that last sort I'm concerned about--yes, they should never be allowed to own a firearm regardless of what their felonies were. That's a case of demonstrated unreliability. If being a drug addict is sufficient cause to keep someone from possessing a gun, then it's certainly reasonable that someone who keeps committing serious crimes should be prohibited too.