Actually charging someone is more complicated than saying you can. Look at Trump. But they can still talk about it just for headlines, and of course they want to cast any shade they can while going into midterms (after all, one Democrat is the same as any other, right?), while also using it as a distraction so their sheep won't notice how Biden is freely giving aid to hurricane victims like a responsible leader should. Whether there's a convincing case or not is secondary to the political theater.
I mean, if there IS a case, then yeah, bring it to a judge. But let's just wait and see if they actually do