Hard to say.  There are those who claim Bitcoin was created by the NSA as the ultimate honeypot.  The reasoning goes something like this:

1.  Bitcoin attracts the criminal element <==prima facie, empirically substantiated, currently held axiomatic.
2.  Those attracted to Bitcoin are criminals <==somewhat of a logical leap, but again, shown to be true in 99% of the cases.  Remaining 1% are weirdos who like losing money, so who cares.
4.  Bitcoin is instrumental in fighting crime by impoverishing those who hold it. <==not life-affirming, handicapping the criminal contingent.
5.  What's more, criminals pay for their own demise (arrest->confiscate BTC->sell BTC (to criminals, who else)->rinse->repeat). <==PROFIT!

Bitcoin is best crime-fighting tool ever, Q.E.D.