Plus, it makes good people more vulnerable !
That is exactly the aim behind gun control. Leftist parties such as the Democrat party in the United States want to protect burglars and home invaders from the rifles and shotguns of the home owners.
The hard-core Leftists want to deprecate private property ownership and move to collective ownership, but they don't/cannot think much beyond that. The people who animate and empower the Leftist want corporate ownership with individuals renting everything (from them.) They see the collectivists as useful idiots since the the path to their respective goals starts out the same.
It is understandable why the leftists pursue such policies. Most of their supporters live off welfare and never pay any taxes. They are averse to working in order to earn money, and therefore few of them own private property.