See what you mean in terms of protecting the worst offenders … sort of a trade-off of awareness vs integrity.

who would opt-in? there seems to be quite a few who claim to like personalized ads and there are probably some small business owners who run fb campaigns who would drink the zucker coolaid (same way many americans oppose universal healthcare and higher taxes on uber rich). but yeah, most real people would probably not agree to that, especially the government db as you mentioned.