Well one of the biggest disgruntlements dissenting Democrats have with Kamala Harris is her support of Israel. That wasn't something Charlie Kirk and Matt Walsh talked about much, but Hasanabi being a progressive cares about it greatly and discussed the topic at length during his DNC broadcasts.
These conventions exist primarily to amp up the nominee's base. Charlie Kirk and Matt Walsh being there doesn't do that; if anything, it stirs up Democrats to come together and make fun of them while they're there. Hasanabi being there, on the other hand, probably reignites lingering doubts held in the minds of people sympathetic to the Palestinian cause.
Yes, just like Beaver said, it shows you that the enemies of the Democrats are not the Republicans, their supporters, or right-wing ideologues in general. The enemies of Democrats are anyone who is sincerely progressive and anyone who cares about the victims of genocide.
reignites lingering doubts held in the minds of people sympathetic to the Palestinian cause.
Reignite lingering doubts?? Anyone sympathetic to the Palestinian cause should be screaming from the rooftops that these people are committing heinous atrocities, literal genocide. They shouldn't be doubted, they should be [redacted].