If you want to kill all Jews anyways, why wait until they reach adulthood?

“The Hamas credo is not just anti-Israel, but profoundly anti-Semitic with racism at its core. The Hamas Charter reads like a modern-day Mein Kampf.” According to the charter, Jewish people “have only negative traits and are presented as planning to take over the world.” The 1988 Charter claimed that the Jews deserved God’s/Allah’s enmity and wrath because they received the Scriptures but violated its sacred texts, disbelieved the signs of Allah, and slew their own prophets.[36] It quotes a saying of Muhammad from a hadith:

The Day of Judgment will not come until Muslims fight the Jews, when the Jew will hide behind stones and trees. The stones and trees will say, ‘O Muslim, O servant of God, there is a Jew behind me, come and kill him.’ Only the Gharkad tree would not do that, because it is one of the trees of the Jews.

Multiple commentators, including Jeffrey Goldberg and Philip Gourevitch, have identified this passage as incitement to genocide.[8][9]

https://en.wikipedia.org/wiki/Hamas_Charter#Antisemitism