Freshwater fish can still have mercury. Even farmed fish can have mercury contamination, if their feed is sourced from the wild.
If you won't eat fish though that sounds more like a you problem.
Nah, I'm perfectly happy with my hot dogs. You're the one eating broken thermometers and fluorescent lights.
There is no law providing for such a sentence, so what you are talking about is either "make billionaireism illegal" or "extrajudicial punishment". In the case of the former, we need a Guillotine Party to take over the DNC much like the Tea Party took over the GOP. Or, we need a guillotine party, French Revolution style, to resolve the problem-class at its source.