If you've ever been to Israel, you can get a good sense of what they face just by looking at the signs in buildings, schools, street corners, etc around rocket attacks/bombs and nearest shelters. Imagine getting attacked so much you have to have signs up that tell you what to do in the event one occurs? They teach rapid evacuation and triage medical assistance in schools for example.
Whilst I won't pretend I understand why the violence persists or the history, Israel would cease to exist if we walked away from them.