As much as I want to see an immoral company to crash and burn, the presented evidences so far have been circumstantial. There is a lack of direct evidences that Uber was stealing IP, as opposed to Levandowski.
I think it's pretty obvious what happened but there are a lot of folks who want to whistle and look the other way.
There are a lot of ways and they're more obvious than what you imply.
Since everyone basically agrees that Levandowski downloaded these files from google, Occam's Razor suggests that the guy who knowingly stole the files provided them along. Doesn't rule out a different sort of malfeasance, but certainly it's worth exploring that avenue to the fullest.
...and that's what makes all Uber/Lev's avoidance look as damning as it is. If the stuff they're not saying cleared them, they'd present more of it - enough to make their case.