Jordan struggles to absorb Iraqis who are still coming in, despite improved conditions at home.
Military options could only make things worse, some analysts say, if they did not go hand in hand with political solutions.
The attack came in Mosul, the most dangerous city in Iraq.
Lawmakers have proved reluctant to touch the topic because it can burn them in primary season.
Readers write about why the world is safer without nuclear weapons, how the government cannot legislate whom churches marry, why America must change the way it invests, and why tickets for men's basketball games cost more than tickets for women's.
The region's democracies need to be defended, as does US nurturing of liberty
The economy is showing positive signs, but the recession is so deep that most 'best case' forecasts still point to a slow recovery.