What everyone should be arguing for is more houses to be built in the UK.
Yup, instead we've got some irrational nonsense about how it's OK to be a landlord if you just have the one rental and you're saving it for your kids but not OK otherwise and people shouldn't profit from human need except they can in other areas and people living in mansions is totally cool but not living in one/owning less sq ft of property/living space but renting some of it out is bad and somehow depriving others of something.
In reality, we've simply got a shortage of homes in general and people's resentment of having to pay rent or that we live in a capitalist country is irrelevant to that.