Exactly my point. If you remain silent, if you just sign an online petition and think that alone will "mean something", then you're kidding yourself.
While it is an elected official's job to represent the people who elected them, it is the citizen's responsibility to participate. They don't come to your door and ask your advice.
In short, the same power (to most extents) is available to gun safety advocates as it is to the NRA. They're just actively using theirs.