Another problem with the increased paranoia affecting the US is it is starting to kill off trade with the States. I have a couple of friends who would regularly visit the US on business. But since 9/11 the delays at Passport Control and the plain rudeness of US Customs officials has made both friends cut their business ties in the US. Both are now trading unhindered in Europe.
Both are of the opinion that US Citizens are not treated so abhorrently when they come to the UK so why are UK citizens treated so in the US?