Crime is lower in places where more people own their homes, communities are tighter, streets are cleaner. All these externalities of crime, community, and hygiene are apparently not a problem when you're a factor.
EDIT: Whoops, alex_smart below has pointed out that I am suffering from the context-loss-disorder that is common on HN. It is true, renting is a positive-sum thing and good for many.
I'd reply, alex_smart, but the downvotes have limited my ability to do so.