I never said they were dumb. It is entirely possible to be smart about a lot of things and to still vote against your own material interests because you have either been manipulated or harbor ideology. Not to mention, most people are fed partial information when it comes to voting on policy decisions. The NYC mayoral election itself is a great example, it's difficult to find any meaningful information on ballot proposals beyond the one paragraph snippet they give you, and any other information on them is usually spun by people who want you to vote for/against.