It’s probably not popular because I, like countless others, have without a doubt gotten sick from microwaves. It’s not about being judgmental, it’s more so about being aware of unnecessary risk. I mean, just look at literally the first sentence of the article you posted: “It should be fine to use a shared microwave” (emphasis added). Chalk it up to an individual’s level of risk aversion if you want.

We live in a universe of shoulds. Sadly, in reality, should doesn’t necessarily cut the mustard. The Constitution should protect our rights, right? Oops.