Well poisoning is an antisemitic talking point, its used as an excuse to target Jewish people by claiming that Jews are secretly poisoning the well from who their people during water.
Jews poisoning wells was a common antisemitic accusation for centuries (and still - Mahmoud Abbas made a very similar, unsubstantiated claim in 2016) Also, accusations of murdering Christian babies to make matzo, generally worshiping the devil and desecrating communion hosts, etc.
what I didn't get was how the poster above was trying to make it sound like a bad thing ("don't they see") - making the enemy of Western values swear off Western infidel technology a perfect well to poison in my opinion.
