I don’t think renting out a room/property automatically makes you a bad person but there does seem to be a correlation there.
My last landlord wasn’t the worst but was fairly thick. Example - the toilet cistern had that little pipe coming out of it in case of overflows. That had been positioned over the sink. It started dripping, then dripped more and more until a constant stream of water was running back along the underside of the pipe, down the cistern, onto the wall then down into the kitchen below.
Landlord wanted to cut a hole in the kitchen ceiling to check that the water running down the kitchen wall was definitely coming from the toilet cistern directly above, because he had a theory it was actually coming from the bath. ???
I managed to dissuade him from ruining the kitchen but he wouldn’t call a plumber so his solution was to attach a longer piece of pipe to make all the water run into the sink