But look across the globe: I would posit that a large percentage of humans have a taboo against insect consumption.
If there are any counter examples that you can state from the world one must analyze how numerically large that community is within that country and the world.
In other words, don't count the number of cultures/communities that are OK with insect consumption, count the population of the cultures/communities that are OK with insect consumption.
I'm reasonably certain the idea of certain food being taboo is almost completely due to cultural norms.
So just because there is a taboo against a food group does not mean that it will definitely be bad for you. There is just a positive probability that it could be.
Taboos can also arise out of fashion and economics, irrational beliefs and moral considerations of a particular culture.
So when we see a Taboo, it is often good to analyze: could this taboo have arisen due to health issues (here pork is a good example because of the danger of tapeworm infection) ? Or could the Taboo have arisen out of cultural reasons e.g dogs/horses are beloved in many cultures so a taboo may have evolved that we shouldn't kill them.
> I'm reasonably certain the idea of certain food being taboo is almost completely due to cultural norms.
TL;DR: Sometimes it due to cultural norms and sometimes its due to negative health outcomes that get noticed due to trial and error over generations.