I think for this argument to carry weight with voters, privacy advocates need to be much more specific about what "coming back to haunt you" looks like. They do a little bit of it later on[1], but I think most people do a rough cost benefit in their head and decide that the small benefit outweighs the small risk (to them).
[1] "And that creates a lot of risks for data breaches, overly broad data collection and retention, censorial legal demands for collected data, corporate and governmental malfeasance, pressure to self-censor, and perhaps blatant First Amendment violations. Every new layer and every new mandate brings more potential for risk. As we’ve unfortunately seen many times over the years, people including high-level government officials will maliciously seek to root out the identities of their critics, so the more layers of anonymity we can preserve in online speech, the better."