But you can be. It's obviously illogical and immoral and unfair, but that doesn't mean the government is not doing it. This guy pleaded guilty and waived any right to appeal, so I guess we'll have to wait for the next test case to roll back this assault on the right to live our lives.
He knew his friends had committed a crime, and they’d borrowed his computer, so then he cleared his browser history. It’s pretty clear he thought there might be something incriminating there, which is why he got busted for destroying evidence.