I once read an article that says bitcoin is used as a payment transaction for terrorists and hackers. And maybe you guys in this forum also already know it. But here i want to convey my personal opinion in that matter. I think that internet and bitcoin interrelated. Many terrorists and criminals use internet .so also with bitcoin which used perpetrator However, despite all these issues, do people make concrete efforts to ban the internet? No. Not because removing and banning Bitcoin is difficult, but because the internet offers more positive than negative. For the same reason, we have to be more careful about our mindset for Bitcoin, because much evidence has shown that Bitcoin brings many positive, if not more, effects than the internet. Internet and Bitcoin are just devices that 'bad guys' and 'good people'. Fortunately, the world is filled with more people in the 'good people' category.
Yes, Bitcoin is being used by criminals all over the world. The other day I even read an article about ISIS using it(Not sure about it's credibility). It has no boundries, it's not restricted by land or territory and is untraceable thus they use it. Yes you are right it all depends on our mindset, but more of the rich people are being affected by bitcoin thus there has been bans on it in many countries.
The amount of BTC used for illegal activities is estimated to be over 1 Billion Dollars however the amount of FIAT currency used by criminals and tax avoidance in off shore tax havens runs into the trillions of dollars.
Lets put things into perspective here.