You Cannot really compare the US with Israel. First of all, we here in the good old USA may live in relative harmony; we certainly do not live in "perfect" harmony, as you state. Secondly, people came to this country voluntarily, knowing that there was a great mix of peoples. But ask the Native Americans about this "harmony". The decades of the ongoing Indian Wars, which nearly exterminated them. And they continue to be the most disenfranchised, poorest of all Americans to this day. The situation in Israel is not the same for one reason. Jews have a historical claim to the land, as do the Pals. But, the Pals do not accept this fact, and view us Jews in the same light as Native Americans viewed the European immigrants to their country: Unwanted intruders. While Jews tried to include the Pals into their new nation, it was they who refused, and used continual violence and terror tactics against Israelis. After so many years of this, is it any wonder the way that many Jews have reacted?
Palestinian reportedly shot dead by Israeli soldiers after approaching Gaza border fence (Haaretz)
from the article: One-state solution is a blueprint for a nightmare