In everyday life, that's fine, you just walk away. In a war situation, you cannot negotiate with them. You simply have to destroy the leadership and the men and weapons they use to try to enforce their will. Then you hope the rest will see the light. This is how Germany and Japan were defeated in the forties.
The only mistake the Israeli's make is that they are too compassionate. They stop too soon, before the job is done.
This was true in the past but now the Israelis stop themselves BEFORE others can step in. The Israeli media begin surfacing doubts and problems and then the rest of the world joins in and criticizes Israel.
Israel could destroy HAMAS in 2-3 days but they hold back, fearing hitting noncombatants. This is not what the US, Russia or any other nation would do. Any other nation would obliterate the enemy and be done with them.
Israel is in a Catch-22 and if she wants to survive in the Post-American Global Obamian Retreat, she'd better start taking tough action against the Islammacists.
Look at Europe, the Arabs are storming the Bastille in Paris holding PLO flags and holding cardboard missiles. This is the beginning of the end for Europe.