Why? Because they're deemed unclean at this time. Therein lies the problem when Nature is reviled. Looking at these Mishugoyim one is reminded of the insanity of extremism and the fact that they all look like extras for a Woody Allen film.
Palestinian reportedly shot dead by Israeli soldiers after approaching Gaza border fence (Haaretz)
from the article: Ultra-Orthodox, Israel Police clash in Beit Shemesh; officer wounded