We all know that Bitcoin is also popular to criminals because they can use it without exposing their identity. It will be more convenient to them to use Bitcoin so that they can hide their identity. Do you think that terrorist groups like ISIS use it for their transactions?
Pretty sure they do. I mean crypto currencies are acceptable almost worldwide, at least in major countries. Crypto currencies gives anonymity to the transactions and it's fairly easy to learn and earn off on. It's not surprising to think that criminals use bitcoin. Besides, thinking that only good people use bitcoin is borderline naive.