Effective border control would be much easier to implement than the settlement program. In fact it largely has been working since the second intifada when they reinforced it. The west bank settlements make israel less safe, not more.

As if Israel, a nuclear power under complete protection of the world's sole superpower, could have any trouble defending its border. Though of course, turning your neighbours into your friends through appeasement and cooperation would remove the need for such heightened defense. The only problem is that it would be the end of their dreams of territorial expansion and Greater Israel.