Yes, it is delightfully out of step with the "system" for people to altruistically volunteer instead of acting out of personal interest. Bravo!
Also, it should be pointed out that (most?) all of the current residents of Graton chose to live there siren and all (ie the siren was there first). The is akin to moving in next to farm and then complaining about the odors and other realities of farming.
It's a very legitimate question as to whether Gratonites would prefer to have a volunteer fire dept with a siren or a community supported (via taxes) professional department. It would be much more appropriate to have a vote rather than a lawsuit. What laws have been broken??
Given that Graton is not a city, I imagine that a special assessment district need to be formed if a professional department is chosen, so that Graton is responsible for its own choice, and not the whole county.
But also be aware that just as there are some people who are unhappy with the siren, there will be people who are unhappy with a new tax, even if it passes, including seniors who are just squeaking by. So which is really the compassionate choice?