Earlier quoted context omitted.
Yours is a very pessimistic view. You have no faith in your fellow human beings. There are a lot of smart enough people out there with sufficient will power to make these changes in their life if only they have the education and awareness of the opportunities. Sometimes all it takes is seeing the impact these changes have. One of the best quotes I have seen about finances is this: Poor people spend what they have and…
Where can you buy a house for $5000 that pays out $500/month in rent?
The unmentioned parts are that (1) fixing these places up costs money on top and you probably can't afford to hire contractors, so this is basically a second job and (2) the renters you get at the low end are terrible, and also require a lot of time and effort. It's not just invest and forget here.