>This sort of vague analogy has been a common rhetorical device used by anti-immigrant populists trying to stir up nativist resentment for 150+ years, without any strong evidence that it’s true. I’m calling the specific sentence out for being usually, in my opinion, toxic nonsense.

Toxic nonsense is what happens when people misuse the idea of scientific proof to lend credence to their political beliefs. Again, I'm not talking to the kind of people who are swayed by that kind of thing. I'm discussing a flaw in the structure of your argument you refuse to acknowledge.

Look, nobody believes "scientific proof" in relation to the things where it's really important (global warming, vaccination) anymore because it's been dragged through the mud by people who want to wave the banner of science in defense of some cause which they think is noble but where the quality of evidence just isn't as strong. That's what I'm concerned about. This is Hacker News, there's nobody for me to scare here.

And, deny it or not, you're being personal, and selective in your responses, which makes me feel this has been a rather unproductive conversation.