GfS, how do you know that the Feds and other law enforcement agencies haven't been investigating these groups? Moreover, some of those I cited are historical, not current. I have known members of the BPP, I even sold a shotgun to one way, way back when. It was a bolt action shotgun with a very long barrel; he wanted it for hunting and it wasn't much good for anything else.

There are enough nut groups in the US to satisfy any argument. The UK, of course, doesn't have groups like the British National Party, Combat 18, the UDF, the Real IRA, and so on. Belfast doesn't have Memorial Gardens and murals, and no one found a mortar in a cemetery a couple days ago.