So while I generally agree with your sentiment, there are some obvious ways that sometime could be an ethical landlord.
What if you have a house that’s too big, so you convert a floor into an apartment? You’re adding to the number of housing units available. Should you be forced to sell a portion of your house/building to whoever wants to live there? Or should you be able to rent it out to someone at a reasonable rate? Do we want rules that discourage people from potentially adding units to the market?
I feel like the “all landlords are evil” narrative is way too simplistic, and that simplistic view turns off people who would otherwise support reasonable limits on landlords and housing ownership. Like, it’s obvious that we need limits and taxes on people who own multiple properties, and it’s obvious that there are companies that exploit renters and drive up prices, but it’s all more complicated than just “landlords evil lol”.