The Earthican Inuhumans wouldn't know that.
If the Kree wanted them dead, wiping out all life on planet Earth would be effortless to them, just do some math, push the right rock towards us, then wait 400 years for it to strike, or tailoring an Inhuman specific virus wouldn't be that hard either, since it's just the reverse of a diviner. The only way that the Inhumans would know that they were a target of the Kree, is if the Kree tried and failed to kill the Inhumans of Earth, and then gave up trying to kill them, or misunderstood a loss as a victory, and moved on top the next abominable mine of (not)mutant scum.
Hickman in Fantastic Four comics said that a filing error by some drunk dip shit clerk lost Earth (okay, I'm exaggerating. %2 of the worlds where terragenesis experiments were undertaken, their locations and existences were "misplaced" before the purge. The Kree had assumed for thousands of years that this problem had been sorted, which is similar to what Pete said when he was explaining the field of play.)
Of course if the misfiling of Earths status as Inhuman free was not an accident, then there would have been a Kree on hand to tell the Inhumans to lay low and shut the #### up, or s/he would get into trouble too for lying about the Earthlings not being genepositive hybrids, but again, that was 30 thousand years ago, but maybe there was a tiny case of Chinese whispers in the inbetween?