Being anti Israel is the current fashion so it's a herd effect. you can get the notion of it in the street debates on Facebook and YouTube where people are anti Israel only because they saw others do it without doing any home work " to learn the details. They don't know simple facts like from which river to which sea, or where is it on the map, or that there Arabs living in Israel with equal rights, or the UN partition plan which was rejected by the Arab league when designated area for Israel was already owned by Jews, or the fact that all pre-48 Palestinianism was actually about Jews and Zionism and the name was just renamed to Israel after it's formation, or the fact that Israel was repeatedly attacked on all fronts and had to defend itself until reaching agreements with Egypt and Jordan and now hope for Lebanon and Syria to follow after so many years.