Equality under the law is vital for liberty and freedom. The ability to defend yourself with lethal force as a last resort must be maintained by individuals.
If it is not, then only agents of governments and criminals will have that ability. It creates a tyrannical system where most are in fear of and dependent upon the few for their security. That is an absolutely horrible idea.
There are a minority of human predators on this planet. We should remove them. At the very least we should make sure they know we are not easy prey. I don't want to taze a sociopath murderer or child predator. No, I want to kill them. Remove them.