> what I’m saying is based on your hypothesis we should expect a population-wide boom in socialism

Correct, which is also consistent with observed data.

> unless there’s a specific environmental factor that exists primarily and only at the intersection of these demographics

I've described two - sedentary lifestyle and diet.

Even the fattest guy in alabama is probably not sitting in an office all day, and he's probably not cholesterol-deficient.

> maybe you could say, MacBook pros specifically are causing socialism

The difference is with endocrine disruptors we have a pretty clear causal model of the process.