Many Zionists use the atrocities of WWII to create an 'us against everyone' mentality among the Jewish world. This same attitude is used to justify many wrongdoings in the name of Israel. Anyone who criticizes Israel or the idea of Zionism is often labelled an anti-Semite (see:
http://www.zpub.com/notes/adl2.html ...not sure how credible this website is but I saw a report on the law suits in a bbc documentary also) and close links with the US allows people who question Israel to be accused of being 'un-American'.
If other countries behaved like Israel the International community would most likely be a lot more vocal but partially out of embarrassment for WWII it is almost taboo to criticize Israel (the spiritual home of the Jews) and they do what they please.
It is easy to criticize Palestine for not being able to establish its own State but when the world's greatest super power is best friends with the same Country that annexed large areas of your land and now subjects your people to concentration camp living standards it aint exactly easy. Israel controls the water, electricity and access routes into and out of many crucial areas of Palestine and as such holds Palestine in the palm of its hand and can crush it at any moment it chooses. It's not easy to function in these kind of conditions.