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