Why would that experiment make sense, though? It's one thing to ask where you get the data, and then it's another thing to ask why you go get it. Like most people don't know anything about electrolysis, because who cares. And then some people, for some reason, have a legitimate need to go learn about it - so they do. But if you don't ever get a reason, you never go learn about it.
The first series of attack waves is a good reason to go learn, but before that, it just looks like the natives are unfriendly. If you were to ask me to speculate on why the biters attacked the wreckage of the ship, I would immediately conjecture that it was low-frequency sound waves; they were impacted and agitated by the vibration of the planet at the time of the physical impact. It's only after they attack a different, separate site - where there was no physical impact - that I would start saying "it must be something else."
And what experiment is he conducting to figure out that it's pollution, anyway? It's not like you could say "let's do an experiment on what makes monkeys angry" without having a monkey.