Yes, Bitcoin is controversial. But not only because it can be used to some illegal activities. But, it can also help a lot of good people who are having a hard time to earn money. There are just some people that are so against bitcoin,and maybe they were the ones who made bitcoin very controversial. It's okay, not all people are into bitcoin. There will be pros and cons. Especially now, bitcoin is rising up. And we have to expect that someone will try to bring bitcoin down