Do not take this as Hamas showing a human side. They are still animals. The quote in the backtracking was reported as follows:
Abu Obeida, a spokesman for Hamas' military wing, confirmed the group was not taking responsibility for the attack — at least yet.
"There may be a later announcement. ... But we don't claim this honor yet," he said. (emphasis mine- from the above linked story at Fox News)
This is more evidence that Muslims are blinded by the deception of a satanic religion. A religion that justifies murder and hatred. A religion that esteems revenge and the slaughter of the innocent over the compassion and selflessness of Christ and the Biblical Christian faith. In the Biblical Christian faith, revenge is left to God, not sinful men.
You shall not take vengeance or bear a grudge against the sons of your own people, but you shall love your neighbor as yourself: I am the LORD. Leviticus 19.18 (ESV)
Do not say, "I will do to him as he has done to me; I will pay the man back for what he has done." Proverbs 24.29 (ESV)
And he sent messengers ahead of him, who went and entered a village of the Samaritans, to make preparations for him. But the people did not receive him, because his face was set toward Jerusalem. And when his disciples James and John saw it, they said, "Lord, do you want us to tell fire to come down from heaven and consume them?" But he turned and rebuked them. And they went on to another village. Luke 9.52-56 (ESV)
Repay no one evil for evil, but give thought to do what is honorable in the sight of all. Romans 12.17 (ESV)
Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, "Vengeance is mine, I will repay, says the Lord." Romans 12.19 (ESV)
Do not be overcome by evil, but overcome evil with good. Romans 12.21 (ESV)
See that no one repays anyone evil for evil, but always seek to do good to one another and to everyone. 1 Thessalonians 5:15 (ESV)