> Why be concerned about your throwaway minutes-old profile with only comments in this one thread?

Not the parent, but that's a weird question. A throwaway account is used precisely because you don't want your main account (and your irl identity) to be associated with something that might get you in trouble.

Giving out information that can massively shrink the number of accounts that may be your real account is counter-productive in that regard.

What possible attack vector is possible using just a city and throwaway account name? The accounts obviously a troll based on the attacks against other users when their claim is questioned.

The city alone will massively reduce the possibilities. As soon as you add any other information (political leanings, for example, as they're easy to guess), you can shrink it even more.

They may still be a troll, I'm just saying that being surprised that somebody doesn't want to divulge information when they've found it necessary to create a throwaway account is strange.

I'm not responding to this comment, just pointing out for anyone reading, that this person knows very well that he and his buddies won't be waiting with a "challenge" for anyone who attempts to publicly criticize BLM or the movement, but instead with a likely doxxing and unpersonning.