Man, this thread is bringing out lots of Freepers who want more taxes! I hope you get your wish, it would simply increase demand for cryptocurrencies and accelerate their adoption. Good luck!
I see no problem with taxing individual to individual remittances to any country.
I would demand to know the source of those funds. Is that source a citizen or resident alien? Is the source wages, and not welfare.
If they are illegal aliens then the money should be seized, and used to locate the sender and deport them.