majorly that and the humans were only try to fix the problem using the old method of Kill it before it infects the universe exstermnatus style
But the Forerunners misinterpreted it as a declaration of war - though really, I think they were just looking for any excuse to go to war with humanity that they could at that point. Good thing the Librarian saved us.
Indeed they really wanted us dead wasn't it because they were buthurt because the precursors were gonna see what happens if they give the mantle to the human?
Yeah, the Precursors were originally going to pass the Mantle onto the humans, but the Forerunners got mad that they wouldn't be the ones, which was why they killed almost all of the Precursors and why they hated humans. Forerunners, baring the Librarian, are dicks.
Problably be a mercy compared to what happened to grevious in the clone wars series (2008) Lazy & incompetent washout villian who comes up with a plan of DANGEROUS proportions only to get his ass handed to him by kenobi and he just runs away like some sort of skrub every single time= No Galactic menace who has combat and command skills on par with jedi council members and can take on at least 4-5 jedi at a single time and wreck their shit= Yes