As for Hamas having the right to self defense, here is what Hamas has to say:

(Hamas chief Khaled Mashaal )
"The rapprochement efforts even involved Meshaal trying to distance Hamas from his previous outspoken support of the Syrian insurgency, arguing that while people "have the right to rise up for their rights," this "must be done through peaceful means." The Syrian rebel coalition known as the Army of Islam responded with disdain: "He who performs jihad out of his office should not offer advice to those in the trenches.""