Hamas co-founder Mahmoud Zahar has said that the goal of the attacks is to force mass migration in Israel and disrupt the daily life of its citizens. Explaining why his group had moved from suicide bombing to rocket attacks, he said:
Which do you think is more effective, martyrdom operations or rockets against Sderot? Rockets against Sderot will cause mass migration, greatly disrupt daily lives and government administration and can make a much huger impact on the government. We are using the methods that convince the Israelis that their occupation is costing them too much. We are succeeding with the rockets. We have no losses and the impact on the Israeli side is so much.[146]
According to the BBC, Hamas views the attacks as legitimate because it regards the whole of historic Palestine (roughly coterminous with Israel, the West Bank, the Gaza Strip and Jordan) as Islamic land, and thus sees the state of Israel as an occupier.
[Hamas] regards the whole of historic Palestine as Islamic land and therefore views the state of Israel as an occupier, though it has offered a 10-year "truce" if Israel withdraws to the lines held before the war of 1967. It therefore generally justifies any actions against Israel, which has included suicide bombings and rocket attacks, as legitimate resistance. Specifically in Gaza, it argued that Israel's blockade justified a counter-attack by any means possible.[147]
Hamas has given other explanations concerning various attacks. Salah Bardawil, a Palestinian legislator who serves as spokesman for the Hamas faction in parliament, has said "We know we can't achieve military equality, but when a person suffers huge pain he has to respond somehow. This is how we defend ourselves. This is how we tell the world we are here."[148] Regarding specific strikes in 2007, Hamas political chief Khaled Mashaal called the attacks self-defense and retaliation against Israeli killings of Hamas supporters.[149] In January 2009 Mashaal called the rockets "our cry of protest to the world"[150] An attack in November 2008 was said by Hamas officials said to be in revenge for the recent deaths of its militants and increased Israeli closing of Gaza crossings.[151] A barrage in December 2008 was described by the group as retaliation for the deaths of three of its fighters in combat with Israeli troops.[152]