@awesomex. This next step will never happen. Think of it this way.
1) Some people have urges to go around killing. They don’t do it, because they know it’s wrong and also they’ll get locked up.
2) Some people have these urges and act on them.
3) Gun ownership is legalised.
Now the governments don’t suddenly legalise mass murder. This last part would be akin to employing a known pederast as a primary school teacher. People have CRB checks to assist in filtering out risks. This trumps an individual’s right to equal treatment.
I understand your concerns, but if any government attempted to pass laws protecting the rights of such people, you would have 95% of the population marching in the streets.