... by default ?
What's the benefits of participating in mixing someone else coins ?
Say 98% of users do not have anything to hide and would prefer all transactions be traceable for the benefits of discouraging bad behaviors ?
I would much prefer someone who stole BTCs to pay a fee to shameless mixer than to help him unknowingly.
Valid question.
What is seen:
Coins are stolen, and there's a statistical method to trace subsequent spends to the culprit.
What is not seen:
Thousands (millions?) of people will be coerced into paying capital gains on coins that appreciate in value. Those taxes will go to fund all manner of government programs. Governments will profit from the appreciation of traceable coins. The coercion has teeth because of traceability.