He's also obviously a puppet, and like Greta Thunberg, isn't going to convince anyone who isn't already convinced, while somewhat annoying even some of the people who agree with both of them to some extent. Maybe they're a rallying figurehead to people already on the boat, but nobody's getting on for climate goblin or Hogg.
Rittenhouse and what happened to him is a good symbol not just of gun rights but the right to self-defense in general, and the chicanery used to try to lock him up for life speaks for itself. That doesn't grant him any particular eloquence, though.