I think there is nothing wrong with bitcoin, the wrong one is the one who abuse it. bitcoin itself is free, all transactions can not be tracked by anyone, with so many people using bitcoin the wrong way.
Crime has become part of human nature. Every thing that can make money there are many criminals. Criminals and bitcoins are well connected. Bitcoin is an anonymous cryptocurrency that helps them transact under the radar. But nowadays, there are many altcoins that do better than bitcoin in terms of privacy so bitcoin is now more of an investment or an asset than the currency used to transact illegally and Bitcoin gives us the possibility to share money directly without any disturbance.