I would not understand either. Americans are welcome in Egypt, just like any other tourists.
In the end, tourists are the first largest source of foreign currency in Egypt.
Anyway, I have enjoyed my time in Egypt very much. It is realy strange to see buildings that have been build over 4000 years ago and still stand higher than my own home.
Yesterday when we where looking at the picturse we made, I asked my father, how high is this pyramid (Cheops) and he said: by the looks of it, it must be around 70 meters... However the thing is still 143 meters high. When you stand next to this thing, it is incredible in the sense that it is high and volumious. However I felt it was not nearly as impressive as the ruins of Karnack or the temple of Horus in Edfu.