I really wish I could say that I have ever been to such a meeting where it served any purpose other than to permit the Government to say they took comments from X number of people at the meeting before they do whatever it was the people who showed up were overwhelmingly against, but I can't.
It only legitimizes their crap.
That isn't saying don't show up, by all means, do, and take the kids and grandchildren. Let them see and understand and get riled. One kid saying "That's not fair!" or "Grandpa, that's wrong!" can make them squirm, and perhaps will someday have some effect.
And teach your kids to shoot, too. They will likely need to know how someday.
This goes back a ways, but back when they were considering lead regulations, this group consistently had people at the meetings making comments about lead paint on bridges. At one meeting, someone stood up and claimed that lead paint on the backs of mirrors was OK because babies were unlikely to chew on mirrors.
And when the final rule came out, it was OK to paint bridges with lead paint and the backs of mirrors were exempt.