The best defense is a good offense.
The American formula for peace is best described as "Peace through strength," where it's a given that "Peace" to Americans means a just peace.
Israel has strength, and using that strength wisely is better than building walls.
"Wars are the second greatest evil that human societies can perpetuate. (The first is dictatorship, the enslavement of their own citizens, which is the cause of wars.)" -- Alice Rosenbaum (Ayn Rand).
Upon reading AR's quotation, it's my thought that the Palestineans are living under an unusual dictatorship, one that has Palestineans enslaved to a cause against Israel, a cause led and fed by those clamoring for another Palestinean state.