Redlisting does not involve blacklisting or whitelisting coins. Think of it as attaching a breadcrumb trail to coins that someone suspects are illicitly gained. It doesn't stop anyone from accepting them or spending them. It does, however, provide kind of an informational bread crumb trail for law enforcement to later track if it's necessary.
It does encourage people to check whether they are receiving redlisted coins, precisely because of what you're outlining. If you know coins are redlisted, you will prefer not to accept them, as they are potentially the proceeds of a crime. This means they can be legitimately removed from your possession, they are someone else's property.
This is a much more difficult problem with a finite money supply. In the fiat system, banks and credit card companies insure against thefts, and the central bank can just print whatever is required to offset such losses as demanded by the treasury department of the government. The money supply expands and contracts to suit all sorts of needs. Bitcoin cannot adhere to this model, whoever ends up with provably stolen funds can only conscionably return them to the original owner.
The solution, therefore, is prevention, not cure. Hard currency limit dictates this. Hardware wallets and cold storage are new concepts that are only for the "experts" and "snobs", as some would say. Let's encourage the developers to make them easy enough for anyone to use with comfort. Let's encourage users to want these things, by talking about them positively, not negatively.
