I normally stay out of these discussions because I do see the grievances on both sides, but Hamas needs to revise its own charter if the statements in the OP are to be taken seriously, IMHO.
The 1988 Hamas charter reads like a committee document, with portions sounding very fair and moderate, but there are portions that do indeed call for the state of Israel to be wiped out and for people of Jewish ethnicity to be killed.
http://www.palestinecenter.org/cpap/documents/charter.htmlHamas Charter (1988)
The Charter of Allah: The Platform of the Islamic Resistance Movement (Hamas)(excerpts follow)
"Israel will rise and will remain erect until Islam eliminates it as it had eliminated its predecessors."
"The time will not come until Muslims will fight the Jews (and kill them); until the Jews hide behind rocks and trees, which will cry: O Muslim! there is a Jew hiding behind me, come on and kill him!"
"The Islamic Resistance Movement believes that the land of Palestine has been an Islamic Waqf throughout the generations and until the Day of Resurrection, no one can renounce it or part of it, or abandon it or part of it. No Arab country nor the aggregate of all Arab countries, and no Arab King or President nor all of them in the aggregate, have that right, nor has that right any organization or the aggregate of all organizations, be they Palestinian or Arab, because Palestine is an Islamic Waqf throughout all generations and to the Day of Resurrection."
"
initiatives, the so-called peaceful solutions, and the international conferences to resolve the Palestinian problem, are all contrary to the beliefs of the Islamic Resistance Movement. For renouncing any part of Palestine means renouncing part of the religion; the nationalism of the Islamic Resistance Movement is part of its faith, the movement educates its members to adhere to its principles and to raise the banner of Allah over their homeland as they fight their Jihad: “Allah is the all-powerful, but most people are not aware.” From time to time a clamoring is voiced, to hold an International Conference in search for a solution to the problem. Some accept the idea, others reject it, for one reason or another, demanding the implementation of this or that condition, as a prerequisite for agreeing to convene the Conference or for participating in it. But the Islamic Resistance Movement, which is aware of the parties to this conference, and of their past and present positions towards the problems of the Muslims, does not believe that those conferences are capable of responding to demands, or of restoring rights or doing justice to the oppressed. Those conferences are no more than a means to appoint the nonbelievers as arbitrators in the lands of Islam." I'm sure there are moderates in Hamas, but there is enough hard-line influence that they haven't revised their charter yet.