In my opinion, I think bitcoin and crime has no relations. So bitcoin cannot help preventing the crime.
Bitcoin's just the currency, like others currencies. You know that, people still use USD but we still catch the high rating crime in every country. And with the bitcoin, we have many types of scams,... and cybercrime.
Btw, if you know the way to stay away from trouble, stay secured, you will be safe in the internet. Good luck

Nope you are wrong. Just take bitcoin address is been legal in your country and your government budget ledger under one btc address. In this case bitcoin will save us from this corrupted politicians. If the amount from one to another we can easily identify it then responsible minister should answer for it. This is main reason still any government staying away the bitcoins. It will secure our taxes from these corrupted politicians and officers.