I and others disagree. You make a false argument that a person is either completely trustworthy or a constant menace. Prison is punishment and protection. Parole and restrictions are protection. Violent felons don’t deserve to get full rights back. Special cases have due process to petition for their rights back on a case by case basis- the way it should be.
You act like ex-cons don’t have access to guns illegally. They all do and they all get them on the black market. If they had access to buy guns legally, at least we would have a paper trail on them. As it is, they buy hot guns police can’t trace back to them. Worse, this creates a market for hot guns.
There is no good that comes from legally prohibiting ex-cons from legally buying a firearm. It does not achieve the desired goal but comes with bad unintended consequences.