Should a hair stylist require schooling and training? Yes, they put caustic chemicals on people’s heads which can cause sever harm.
Should police have more training? Yes.
This isn’t a good argument because the lack of police training has no bearing on the licensing and training of hair stylists.
Here’s the take you are trying to get people to say, if you cannot afford to own a home without supplementing income by provided room rentals which are potentially unsafe and do not meet the bare minimum of fire code, then you cannot afford that house. It doesn’t mean you don’t afford a house. Just that you cannot afford THAT house. And I make no mention of “deserve housing” because all humans deserve housing.
Putting people’s lives at risk to make a few extra dollars is unacceptable. You have no right to gamble with other people’s lives.