A U.S. Marine was killed by ISIS terrorists on Saturday in Iraq. Let that tragic reality sink in for a moment.

According to the Department of Defense, Staff Sgt. Louis Cardin of Temecula, Calif., “died in northern Iraq, from wounds suffered when the enemy attacked his unit with rocket fire. The incident is under investigation.”

“Several other Marines were wounded,” Pentagon Press Secretary Peter Cook said in an additional statement. “They are being treated for their varying injuries.”

Compared with the media’s unrelenting coverage of the bitterness surrounding the 2016 presidential campaign, a U.S. Marine being killed in Iraq has barely made a blip on the national radar screen.

“This is the second combat death since the start of Operation Inherent Resolve, and it reminds us of the risks our men and women in uniform face every day,” Cook added.

I am outraged that ISIS thugs murdered a brave U.S. Marine serving abroad. Here at home, it sickens me to watch so many Americans tearing each other down instead of coming together to tear down ISIS.

We have real differences at home on the political front. There are important policy differences we need to sort through and even argue through in this election season. But rather than focusing so much on how angry we are at one another, what if our nation directed a due measure of its rage at the terrorists who have been butchering Americans in Iraq, Afghanistan, Paris, San Bernardino and Chattanooga?

According to The Press Enterprise, Staff Sgt. Cardin served twice in Iraq and three times in Afghanistan. The newspaper reports that Cardin, who was affectionately known by family and friends as “Louie,” is survived by a loving mother and six siblings. He would have turned 28 next month. Instead of preparing for a celebration, the fallen hero’s family will watch as their Louie’s flag-draped casket is saluted by fellow Marines at Dover Air Force Base in Delaware.

“The loss of a service member greatly affects us all,” the II MEF statement added.

This courageous Marine’s death should have a similarly profound effect on the American public. An attack on a U.S. service member by ISIS is an attack on each and every one of us.

As the Cardin family grieves and injured U.S. Marines lay in hospital beds, we not only owe them eternal gratitude, but our attention.

“An American flag and a Marines flag hung outside the Temecula home of Cardin’s sister, Polly Lyons, on Sunday,” The Press-Enterprise noted. Maybe we should start there. To honor this departed warrior, his wounded fellow Marines and their families, let’s all hang American flags outside our homes. If your neighbors ask why, tell them to Google an important name: Staff Sgt. Louis Cardin.

We must honor the fallen. We must pray for the wounded. We must ask God to comfort their loved ones.

We must also demand that ISIS be utterly and completely destroyed. The survival of those very flags hanging outside our homes, along with our children’s futures, rest on our generation’s will to unite.

“Our thoughts and prayers are with the service members involved, their families and their coalition teammates who will continue the fight against (ISIS) with resolve and determination,” Cook’s statement concluded.

For Americans who love freedom, the best way to salute the life and legacy of U.S. Marine Staff Sgt. Louis Cardin is by coming together. The time is now.

Tom Sileo is a Senior Editor of The Stream. He is co-author of Fire in My Eyes and Brothers Forever, and recipient of the Marine Corps Heritage Foundation’s 2016 General Oliver P. Smith Award for distinguished reporting. He can be followed on Twitter @TSileo.