Sinwar was born in 1962 in Gaza’s Khan Younis refugee camp to a family that was among hundreds of thousands of Palestinians driven from what is now Israel during the 1948 war surrounding its creation.
And the next generation will be born to survivors of this.
People raised in situations like this don't often grow up into peaceful people, because they're not raised in a peaceful environment.
That's why (as many jokes were made about it) America switched to "hearts and minds" half a century ago.
https://en.m.wikipedia.org/wiki/Hearts_and_Minds_(Vietnam_War)
If you try to crush a population for obedience, you can't ever take the boot off, and they'll always try to push you off. You have to genuinely look out for their best interests and over time win them over.
And that would take a very long time for Israel to convince their neighbors, but it's the only way for a permanent solution besides Israel killing all of their neighbors, which (and I shouldn't have to say this) is not an acceptable solution.
You can't ask the victim to "be the bigger person" if they do it first, they're still under the boot and the boot won't move.
That's literally why the phrase is "be the bigger person" because part of it involves the stronger person being the one who wants peace.