If Hamas were to ever repudiate violence, they would then be in exactly the same position of Fatah after Oslo. Hamas would have to kill off those in-house armed elements, who wanted the fight to go on, or go into competition with them. I can't see any advantage to replaying the same scenario, over and over again. This kind of Euro meddling seems more likely to prolong the peacemaking process, than to create peace.
World Jewish Congress: Nazi train treasures must go to rightful owners (Reuters)
from the article: Foreign Ministry protests EU contacts with Hamas officials