“In the early 1980s the occupation authorities encouraged the founders of Hamas, hoping that they would create a counter-weight to Yasser Arafat and the PLO. Even after the start of the first intifada, the army and the security services gave preferential treatment of Hamas.” —Uri Avnery, long-time Israeli writer and peace activist

Hamas's suicide bombing is what they call "blowback".

(It shouldn't be necessary to add this, but it is:"blowback" is not a synonym for"justified.")