Destruction of evidence is itself a crime. The difficulty is always in proving that's what happened - by definition you're missing a key piece of evidence.
I'm less concerned about the destruction of evidence and more concerned that even though we know she's committing criminal acts, people are still supporting her for President. What does that say about them? We see criminals get away with things all the time, but usually they don't have a cheering section, and even if they do they're not trying to vote for them as President of the United States. Trump may be all the things they say about him, but Hillary is a criminal NOW, so what is she going to be like as President? If something does happen, it would be a giant SHE TOLD YOU SO.