Because people only now about the ''country for jewish people'' part of their program, which makes them nationalists and all nationalists are authoritarian right. The fact that Theodore Herzl wrote his program with strong socialist note and his successors took it to heart is completely unknown to most people. Even those who heard about kibutzs mostly think they are the same as settlements of the religious loonies. Which made it funny to read about all of this in time of Yugoslavia, which was an ally of the Arabs (except Jordanians), but in some publications you could read between the lines that countries have a lot in common.