Olgar Shiverstone
Legend
The story I'm referring to within Foundation is from the perspective of the "natives". Narrator changes multiple times through the initial Foundation book, since it spans many generations. IIRC most of the sequel books -- Foundation's Edge and beyond -- stick to a traditional novel format of single story and narrative perspective, but Foundation, like I, Robot is a connection of stories with a connecting story line, which I think were originally published episodically in places like Analog.This book was written from the perspective of one of the "intermediaries" IIRC, or at least someone who aspired to be one until he learned what a-holes the colonizers were. The Foundation books, as I recall, are all from the perspective of Foundation people.
I think there may have been an element of false help from the colonizers as well. Something like "We're here to help you with this ecological problem you're having", and then it turns out they actually caused it.
I'm not saying it is Foundation; just that what you're recalling still fits.
I've seen the "we're here to help (a situation we caused)" trope in a number of SF stories. Heck -- back on topic -- Star Wars did it in Timothy Zahn's original sequel trilogy!