no one has ever denied that they once did. what is questioned is the right they claimed in the last century...and still claim...to displace their descendents who had remained in palestine simply because they had become muslim. which contrary to your opinion, does NOT necassarily make them anti-semite; especially considering that many jews are included among those who question it.
Hamas' Khaled Meshal met with Saeb Erekat in Qatar (Haaretz)
from the article: A new museum confronts an old mystery at Masada