From this article:

In 1992, I was recruited to the Hamas shock troops in the camp by a friend in the movement. Our task was to defend the organization against infiltration by undesirable elements and to wage war on corruption, negative social trends like theft, prostitution and drugs and, of course, on traitors.
As members of a cell, we attacked suspected collaborators with Israel, some of whom were put to death. In order to get the truth out of suspected collaborators when we interrogated them, we used to break their legs and arms with iron bars and chains and to stab them with knives. It was not cruelty for its own sake, but the way an underground organization has to operate in occupied territory.
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Fatah is a good, positive organization, but mistaken in its ideology and deeds. I have brothers who support Fatah, and despite the great arguments between us, I love and respect them. Still you must understand that Fatah, in its concessions to Israel, its recognition of the state of Israel and its joining in the peace process, is totally unacceptable to me. You also realize that it was Fatah as the Palestinian Authority that arrested me for seven months.
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As for the peace process, I personally am against it. It entails recognition of Israel, and that runs counter to Islam and Hamas. Even if [the Israelis] were to withdraw to the 1967 lines, give us Jerusalem and the right of return, we should not recognize Israel. All of Palestine, from the sea to the river, must constitute the Islamic Palestinian State.
I am not a murderer. A murderer is someone with a psychological problem; armed actions have a goal. Even if civilians are killed, it’s not because we like it or are bloodthirsty. It is a fact of life in a people’s struggle against a foreign occupier. A suicide bombing is the highest level of jihad and highlights the depth of our faith. The bombers are holy fighters who carry out one of the more important articles of Islam.
I always saw Israelis as murderers and as an occupying enemy who had inflicted pain on us, and who were still hurting us, and who must be expelled from our land by whatever means.

We had dinner last week with Dave Trowbridge, of Redwood Dragon and his talented and lovely partner; she asked a pointed question:”How do you let the heat out of this issue?” How do we stop growing terrorists?
Because I believe profoundly that we not only need to defend ourselves against them in the short term (which is best done by attacking them on their territory, rather than waiting for them to attack us on ours), but to somehow stop growing them (which unfortunately is possibly encouraged by attacking them on their territory). Tough problem.
Read the interview…