In order to avoid peace, it is necessary to make demands that the other side will not meet without a guarantee of something in concern. Hence the preconditions. They serve to ensure the talks won't go anywhere -- and that it will be the Palestinians will look unreasonable. So? The situation's clear to everybody. Why the article?
U.S., allies conduct 20 air strikes in Syria and Iraq against ISIS, says U.S. military (Reuters)
from the article: Peace is not child's play