You're basically arguing that lobbying doesn't work. Lobbying by citizens can, in fact, work, and lobbying a Democrat on a human rights issue is more likely to work than lobbying a Republican. Of course, Kamala can ignore you (or tell you to shut up, like here), but she's at risk of losing votes.

Telling protesters that they're helping Trump win is incredibly tone-deaf, and the influence of Biden is showing. This is something that Biden would say to protesters.