You mean to tell me that increasing supply lowers price? Fascinating.
Unfortunately, there's a lot of people -- especially further left -- who fight this kind of reasoning. They insist that the housing market is different , and that just building more private housing won't help. No amount of evidence will convince these people, because they already made up their mind ahead of time: their ideology says the market can't help, so the market can't help, period. Any evidence to the contrary…
It is of overall net benefit over the long term to raze a small three story walkup apartment and build something denser, overall increasing the amount of housing.
However, in the short term it's immediately quite (sometimes existentially) bad for affordability if existing affordable housing is destroyed and replaced by brand new (and thus inherently luxury) housing.
So accordingly we naturally see low income housing activists push back against some redevelopment and ask why development is not occurring in wealthy single family home areas where the amount of people impacted is less and class those that are not remarkably negatively impacted.
Personally I think the data shows that in general it is still really beneficial to build out as much housing as possible and avoid the negative impacts of a shortage, but I do think there are people validly pointing at a real problem of displacement.