Hebron is an ancient Capital of Israel, so not only is it a religious centre, but also a political one. This double whammy of religion and National history are a threat to the marxist worldview, which denies both. Now, ironicaly, the arabs also hold Hebron as s Holy city, precisely for the same reasons as the Jews do. It is perhaps more comparable to British teenagers going to stonehenge than to visit auschwitz.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: How school trips to Hebron resemble visits to Auschwitz