There are admittedly some comments that are in the margins, but the number of false positives/negatives is probably pretty close to zero.
In particular, those who rant about the evils of uncontrolled rental markets are 99% likely to not own real estate in San Francisco.
Therefore, those commentors aren't commenting on the objective good or bad of such issues, so much as they are just explaining what their personal situation is. As soon as those people who cried the evils of uncontrolled rental markets came into possession of San Francisco property, they would immediately change their tune.
Should we place any value in ethical principles which are so immediately seen to be self-serving?