Since I have lots of peso notes from my trips to Mexico, I think I will send them as payment of my Fed income taxes on April 15 in lieu of US dollars. If they won't protect us against invasion I see no reason to pay them in hard earned dollars.
The Treasury Department's IRS Gestapo, that fraudulent band of thieves that come to kill, steal and destroy, have no compunction whatsoever in prosecuting Americans that don't participate in their fraud. Screw'em.