A former Army Ranger who fought in Afghanistan sounded off this morning on what celebrities are saying after the Manchester concert bombing. 

Singer Katy Perry said after the attack that "the greatest thing we can do is unite as people and love on each other." 

"No barriers, no borders, we all need to just coexist," said the global pop icon. 

The sentiments were echoed by stars like Miley Cyrus and Justin Timberlake. 

Sean Parnell, author of Outlaw Platoon, reacted on "Fox & Friends" by saying the responses are "out of touch" with reality and the threats that ordinary people face.

"It's really easy to say 'coexist' and advocate for open borders when you live in a gated compound surrounded by armed guards and security every day. They basically live in a bulletproof bubble," he said. 

Parnell agreed the grieving families need love and people should unite, but stressed that "candlelight vigils are useless without a proactive action step" to target ISIS and "kill them" where they operate. 

He recalled that his views come from serving in Afghanistan, where he said 90 percent of the missions were to distribute humanitarian aid, like food and crayons, to children. 

Parnell recalled a harrowing mission in which one of the aid convoys was attacked and American soldiers were wounded.

"At that moment I realized there are people in this world that just want to kill you for who you are and what you stand for," he said.

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