All signs point to MACUSA’s highest priority being to maintain secrecy between No-Majes and wizards, which could be an irritating prospect for the Head of Magical Law Enforcement, if they’re constantly made to prioritize the welfare (and intended obliviousness) of no-majes above everything else.
That brings us to the final point, which was Grindelwald’s objective…
Based on those snippets, there seems to be some frustration brewing inside Graves.
So, it seems like a fair guess to say that these clips suggest Graves might be fed up with wizards being in the shadows, or otherwise hunted.