Maybe they're hoping to inspire others to join them in this action, possibly leading to a key player treating the FCC like this. What's Google's stance on net neutrality nowadays?
The FCC chairman is not elected. Nor is he appointed by Congress. They can all genuinely claim that they had little or no control over his decisions.
So it does not matter if everyone pulls a stunt this time.
Besides, if the man isn't lying and he somehow subverts state laws that prohibit municipal networks, then that more than makes up for any other wrong he has committed. I can sure as hell influence my city council more easily than I can influence the federal government.