Raising the lowest education level and the lowest happiness level would go a long way. i.e. a society that genuinely looks after and educates everyone. Easier said than done though.
You're absolutely right. I'm kind of pessimistic these days about the future.. Education the critical thing we need to even start moving in the right direction.
But so many of the terrorists were well educated. They don't suffer lack of money or education, they suffer from a lack of meaning in their lives.
I've heard this claim as well, and that's why I say happiness as well. But that's even harder than education to both define and achieve.