Asssuming that we all can agree that felons should be denied their natural rights to live freely, including the right to keep arms, vote, serve the public in any official capacity, etc. Why is it not as simple to deny the rights of those who prove to be incompetent.
Do we really need a judge to determine this. Well maybe so. If one is incompetent with any dangerous tool, car, gun, hammer, alcoholic drink, whatever, then it follows that ...
If you act like a retard, maybe there should be a way to keep you from your natural rights.
Lock them up with a soap magazine and make them shit in a bucket. It is called prison. You no longer get to exercize your natural rights.
Editing: Oh and no more safe places. Let them all live together in open spaces. Darwin rules for all!