Here's an argument for rent control: Mixed income neighborhoods are more vibrant and thriving compared to more homogenous neighborhoods. Living in the Mission, I definitely feel like the comfortable mixing of multiple cultures and socio-economic classes is what makes it such an exciting neighborhood compared with SOMA where it's either all yuppie apartments or run down slums with nothing in between.
San Francisco hoods. SOMA is "South of Market" and is kind of industrial; It's being revamped with live/work lofts and lots of SMB / Shared office spaces.
Mission is another neighborhood which is pretty much a shit-hole, but IS a cool place. There are lots of great places to eat and drink and there are festivals, parties and parades most every night.
Usually when you hear about someone being shot, it's either in Oakland or the Mission.