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 it's up to them to use bitcoin as their illegal activities helper besides, they do not look and it does not give adverse effects to bitcoin, it will help bitcoin #imo
you're also free to use for anything with bitcoin