Some proponents know exactly what they are doing when they destroy the private housing stock with rent control. Here is NYC's new housing czar Cea Weaver explaining that (of course) rent control will destroy private ownership of housing and usher in the era of "full social housing":
We decided that fighting for rent control was a strategic and critical first step in the fight for full social housing.
So a lot of times people ask, why are we fighting for rent control when we have NYCHA [NYC Housing Authority]? We should be fighting to save our public housing.
We decided that through a program like Rent Control, we are able to directly challenge the logic of unfettered profit in the real estate market, and we are able to directly challenge housing as a wealth building tool, and through regulation, strike a blow to the entire real estate industry at once. And so the beauty of rent stabilization and rent control is that it weakens the speculative value of the real estate asset. The value is no longer based on what the landlord is able to get, but rather it's based on a state public board who's deciding how much rent is going up...
The idea is that we could weaken the entire industry at once through a strong rent control campaign, and that that would strengthen our ability to do things like fight for social housing.