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?
Why not. ISIS has a strong intelligence i think and transacting with bitcoin would likely be a good option for these no-gooders. These people obviously are not stupid and btc would already be in their radars. Sad to say, but btc's features can also be taken advantage of by evil people
Bitcoin is a tool and can get into good hands, or maybe into bad hands. Similarly, we can talk about dollars - they are also used by terrorists. It is not necessary that people had bitcoin associations - terrorism
Yes, bitcoin is simply a tool, so as long as there are bad people in the world it will inevitably used at some point for something bad.