The age of short attention spans? I mean, look at how Trump has operated thus far; he's undergone weekly scandals that would have broken other administrations long before now. But no one really cares anymore; the outrage meter has been broken. It's a holding pattern from one crisis to another and the media is complicit. There stills seems to be this idea you have to cover both sides fairly, even if one is wholly evil. It's a stupid system made for ignorant and lazy people.
As for Mueller, the "funny" thing is, Trump supporters will use it as definitive proof if it shows Trump is innocent but it won't mean a thing if he's guilty. It's a cult of evolutionary rejects.