Many naysayers just don't believe what's in the Hamas Charter.
Here are the points.
The principles of the Hamas are stated in their Covenant or Charter, given in full below. Following are highlights.
"Israel will exist and will continue to exist until Islam will obliterate it, just as it obliterated others before it."
"The Islamic Resistance Movement believes that the land of Palestine is an Islamic Waqf consecrated for future Moslem generations until Judgement Day. It, or any part of it, should not be squandered: it, or any part of it, should not be given up. "
"There is no solution for the Palestinian question except through Jihad. Initiatives, proposals and international conferences are all a waste of time and vain endeavors."
"After Palestine, the Zionists aspire to expand from the Nile to the Euphrates. When they will have digested the region they overtook, they will aspire to further expansion, and so on. Their plan is embodied in the "Protocols of the Elders of Zion", and their present conduct is the best proof of what we are saying."
For a more detailed copy, go to: http://avalon.law.yale.edu/subject_menus/mideast.asp