We can bomb Islamic State terrorists, but it will only serve to recruit more fighters from otherwise moderate Muslim populations. Is there a secret weapon to defeat the IS. Yes, and its probability of success is 100%.
All actions have consequences. In the case of Carter’s betrayal of the Iranian government, the entire Middle East became unstable. Russia invaded Afghanistan, giving rise to the Taliban that we supported with anti-aircraft missiles and other weapons and training. Following defeat of Russia by the American-armed Taliban --- well, you probably know the rest of the story.