Imagine if you have a business and someone uses their tainted coins (from a hack or extortion or whatever) and buys something from you. You then deposit this on

Imagine if you have a business and someone uses their tainted coins (from a hack or extortion or whatever) and buys something from you. You then deposit this on an exchange... And get your account locked. Or worse, imagine using your Bitcoin wallet in a store, and the business owner sees that you have $100k in the wallet you just paid with (because it's public knowledge). He then calls his friends who will follow you and try to kidnap and torture you to hand them over.