If people want to throw up their hands and start believing whatever feels right, they are permitted to do so. Though they have a duty not to as citizens of a democracy, they have the right to actively pursue policies based on falsehoods. Let's not pretend it's a reasonable or respectable reaction to seeing billboards.
If somebody does want to give up on research and working out the truth, please actually give up and say you don't know. Stop coming to the city council meetings and plastering "millions of gallons" on even the social medias where that's surprising.