So your issue is that owning a house is too expensive because housing is artificially scarce but you don’t think that privately owned investment properties is the fault of that? Renting will always cost more than the upkeep of a house because otherwise nobody would lease. The only reasons housing prices changing is a worry to homeowners is because housing is artificially scarce and the artificial scarcity changes based on how much of the artificially scarce housing investors decide to put on the market. All your issues with personal ownership of a house stem from other people treating housing as private property that can be invested in.
Australian here, the only people I have interacted with IRL who Ive talked about it with are members of my political party (we are socialists). It has been a mix of positivity and questioning how or if it will actually change anything or lead more people to joining the movement. It has certainly lead to a lot of online discourse but whether it will lead to any real movement building or change is yet to be seen. There is also the question of how useful individual acts of violence are when there isn’t a mass movement behind them. I have also seen people calling the shooter hot and such. There is no sympathy at all for the CEO and the people I have talked with all think he had it coming