The TSA and immigration officers at points of entry are nearly as bad as people make them out to be. It's a little like judging Chicago as a war zone based on stats from a very narrow geographic area with high violent crime rates: it isn't representative -- it's just that nobody ever gets "outraged" over the times they are treated well by customs/immigration/TSA. It's the same thing as tourists avoiding France because of terror incidents when in fact tens of millions safely visit France every year.

Criticism of TSA are certainly fair, but as someone that flies to the US from Europe monthly, the fears are definitely overblown.

Seriously, don't sweat it. The fears are overblown and not based on any actual data other than anecdotes from highly vocal bloggers/etc.

About 1 million visitors a day enter the US through airports in the US and about 360 are denied entry -- most of those because they had prior visa violations that deemed them inadmissible and others because they didn't have a valid visa. So 0.03% denied entry. In the U.K., that percentage is about 0.02%, just for comparison.