I know it's counterintuitive! but for newbies/ordinary, non-hardcore users it's better to use a mixer, or a CoinJoin application like Wasabi if because they merely want privacy and untraceability. Would you say it's OK for them to use some mixer that could taint their coins if all they want is mere privacy? What would you say to them if they're coins are withheld by an exchange because of taint?