BTC indeed the future but FIAT will not die that's what I believe it, naturally people are skeptics cause maybe they see prices is fluctuate. I read articles about BTC used by cyber crime and I apologize that the article is not useful for me 
crime can occur anywhere I think that fiat and gold can also be associated with it.
Yes, but transferring BTC is much simpler the moving around a pile of cash or bits of gold, don't even mentioning doing it internationally. It is not about what "could" be associated with it but "is" associated already. And we can not really move forward with the adoption of crypto while it is associated with out of sight money transfers and simply scam projects. crime can occur anywhere I think that fiat and gold can also be associated with it.