Bitcoin is an open source where majority of the individuals believers of bitcoin knows this things.
But it doesn't mean we must be scare of it, of course not! Bitcoin can be use for illegal activities if the user are one of the abusers.
But if not, most often bitcoin being use to help others not to harm anyone. And I never heard that bitcoin being use in criminality ever since I started here, I don't know in the other country if that happen.