Does it? It seems like you are right that most people here not against the US carcaral system per se, only its occasional overuse. It's a fact that still amazes me, and would seem to argue against your opinion that this place is exceptionally radical.
But I'm not understanding your logic here. You are for the abolition of prisons, but are also averse to a mass movement's exploring whether other people are for abolition? It's surely worth exploring at least, isn't it?
It might be helpful to go back to Carrol's original statement and its parenthetical qualification, which perhaps shouldn't have been bracketed: "to reach those of the 75% (who can be reached)."