Twice now I've interviewed candidates who in the interview offered to share confidential information from their company with me. In both cases we not only did not hire them, we made it a point to note why we didn't hire them in case they ever applied again in the future.
Once someone admits that they are willing to steal information and basically sell it to other companies there really is no excuse to hire them unless you really want that information. You can't trust them not to steal from you in the future, and even if you don't use the information it's going to be hard to prove that fact if the theft eventually gets discovered.
To be blunt the fact that Travis supposedly told him to destroy the information doesn't make him look much better to me at all. Knowing that Levandowski straight up stole from Google and hiring him anyways makes Travis look either ridiculously incompetent or straight up malicious.