You can’t get busted for destroying what you didn’t know what evidence. If you could we wouldn’t need trash collectors because nobody would ever get to get rid of anything.
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.