You are suggesting a coin black list.  It is possible.  All you need to do is create a modified client and modified mining software that does what you want it to do:  ignore all transactions that contain any of the blacklisted coins (those coins currently contain in the two know FBI addresses),  and release it into the marketplace.  Those that believe in your idea will use your client, those of us that know it is stupid will not.  Once the coins move you will create a hard fork and your new alt blockchain will be born.