Nostalgia is a harmless enough vice except when it becomes a utopian philosophy. If the historical preservationists in Petaluma were to adopt a town motto, I’m guessing the winner would be…”The Older We Get, The Better We Were.” Some of these backward-gazing folk won’t be happy until Petaluma sinks into the river, only rise once-a-year like Brigadoon on Butter & Eggs Days, with the locals decked out like the cast from The Music Man.