you forget to mention bitcoin for a ransom.
like ransomware wannacry virus.
and you know what, few years ago, there are a terrorist in indonesia that want to be paid in bitcoin.
this is bring the bitcoin to the next level of crime.
I also heard that some illegal transactions are being made through altcoins due to its anonymity. But hey, illegal transactions are being made even with fiat money. The point is, we should weight bitcoin by its use, convenience, and value than by this isolated illegal transactions.
Indeed,we must see the more importance of btc, its role and its application we cant really knew what other thing it can offer to us,but its too beneficial to lose.