I think all currency has been used for illegal activity not just USD. So theres no reason for others to blame crypto that is being used for illegal activity because even fiat is being used.
i am agree, because in many country, there are many illegal activity using money and there are no clue how much they using this money to illegal activity. and if there are a way for crypto to being involve with illegal activity then its normal. but we should not make any illegal activity.
i think every currency is use to facilitate the people of a country in a legal way, so i thin not a sing currency yet made specially for illegal activities. but as there are every kind of people in every society good and bad, so good people use currency for good activities while bad people use it for illegal activities.