Average lifespan in Gaza is already so bad the average age is mid-teenagers. Historically speaking, when an invading genocidal army disarms the survivors they don't start living longer on average.

Also, to use the US as a historical example, when an invading army comes to confiscate guns and powder the native population gets MORE violent. At least in the US's case the invaders lost. In this case, the invaders are backed by nuclear bombs and I just don't see the native population surviving.