But on a basic common sense level, if the starting point is fewer people getting killed, the most basic solution is bodyguards and so on.

That assumes that the bodyguards never use violence and beat somebody to death. Simply increasing the amount of people who can beat other people up doesn't automatically reduce violence. South Africa has a lot of body guards and it's still a lot more violent then states in Europe.

Giving the government the monopoly on violence is a standard enlightenment idea that works well if your state highers enough policemen and the citizens believe in the rule of law.

Playing status with accounts one could throw away at any second and register three new ones in its place would be really, really stupid, let's try to not accuse each other with at something that simplistic.

Status interactions are deeply ingrained in the way humans interact with each other. It not something that get's shut down just because a discussion is online.