What do you mean "it assumes that the 'activists' a. had their own public comments section"? In this scenario, neither the anti-flock nor anti-abortion activists appear to have had a public comments section on their respective topics. You're the one assuming that anti-abortion activists did have their own public comments section, which I cannot find any evidence for.
Whether or not they "monopolize" the meeting is just a question of degrees - just assume that the anti-abortion activists dominate the meeting to the same degree as the Flock critics in this scenario.