The laws governing tenants' rights came about due to widespread abuse by landlords. It got bad enough that the people actually got together and passed some laws making it difficult for landlords to be dicks.
As a class, landlords in SF brought this on themselves.
And, tenants brought the housing shortage on themselves (at least in part). As far as "abuse," one serious problem with rent control is the complete disincentive to improve/make repairs. Actually, it is an incentive to drive out tenants by being abusive/neglectful.