This is like the question I’ve always asked about getting sick.
Do you produce extra mucous because your body is trying to get rid of what’s making you sick or does the illness make you produce more mucous in order to spread more easily?
I suspect the serious answer is that we produce mucus and sneezing as a natural response to microbes, and that’s the environment within which microbes have evolved to take advantage of the mucus and sneezing
Mucus is one of the bodies innate methods of protection, same with vomiting, same with crying same with sweating. The body knows something is wrong so it kicks the production of those into overdrive to hopefully force whatever was in it out. Its why we start sweating, salivating and sometimes vomit when we eat super spicy peppers despite the fruit being room temp amd full of water
