Terrorism and mass migration are bitter results of outside meddling in the Middle East. They will intensify. Interventions multiply our enemies. Every village raid, every drone strike, and every shot fired in anger on foreign soil produces anti-Western passion. Some are shocked when that passion leads to violent reaction. They should not be. The instinct to protect one's own, and to strike back against attackers, is as old as humanity itself. Horrific terror assaults cannot be justified as any kind of self-defense. Their savagery is inexcusable by all legal, political, and moral standards. But they do not emerge from nowhere. It was never realistic for the West - the invading world - to imagine that it is an impregnable fortress, or an island, or a planet apart from the regions its armies invade. This is especially true of Europe, which is literally just a long walk from the conflict zone. Now that Russia has joined the list of intervening powers, it too is vulnerable. So is the United States. Countries, nations, and peoples must shape their own fates. Often they do so by reacting to oppression. Religion kept Europe in the Dark Ages for a thousand years. Russians and Chinese accepted brutal Communist rule for generations. Violent extremism in the Middle East will end only when people who live there end it. That cannot begin to happen until outsiders leave the region to its own people. The Middle East will not stabilize until its people are allowed to act for themselves, rather than being acted upon by others.