(CNN) As Rick Healey and his wife were taking a tour of the kindergarten class where their 5-year-old girl will go to school next fall, they came across a poem that stopped them in their tracks.

Lockdown, Lockdown

Lock the door

Shut the lights off

Say no more

The lyrics are plastered on a white piece of paper in large, colorful markers in Ms. Kim's class at Arthur D. Healey School in Somerville, Massachusetts.

"I recognize the necessity of it, I know why it's necessary, but it upsets me and disgusts me that it is necessary," Healey told CNN. (He's not related to the person the school is named for.)

Healey's wife, Georgy Cohen, posted a photo of the poem and tweeted: "This should not be hanging in my soon-to-be kindergartner's classroom."

The many steps schools are taking

With an average of one attack a week this year alone, school shootings are now a reality students and teachers live with. And school officials are trying to tackle the danger however they can.

In Pennsylvania, a middle school handed out bullet-resistant shields . Louisiana now allows kids to carry bulletproof backpacks in the halls. And in California, students fed up with lawmakers' inaction took matters into their own hands by writing their own gun control bill

Somervile Mayor Joseph Curtatone and School Superintendent the poem in Kim Conley's class is an example of "how one of our educators used a rhyme to help her young students stay calm and remember the key steps they would need to follow during a drill or real emergency."

"As much as we would prefer that school lockdowns not be a part of the educational experience, unfortunately this is the world we live in," they said in a statement to CNN. "It is jarring -- it's jarring for students, for educators, and for families."

The painful feelings it brings up

Go behind the desk and hide

Wait until it's safe inside

Healey said reading the poem reminded him of the shooting at Marjory Stoneman Douglas High School -- his alma mater and the target of a February 14 shooting that left 17 dead and several others wounded.

Seeing the lyrics brought up "difficult, negative feelings," he said.

Since 2009, the US has seen 57 times as many school shootings as six other industrialized nations combined.

The fear is so pervasive that last month, students around the nation shared a hashtag "#IfIDieInASchoolShooting , offering a woeful glimpse into the sense of apparent inevitability that someday soon, they'll be felled by bullets on campus.

This is the new normal

A few weeks ago, Cohen said their daughter came home, excited to share a fun game she played with her pre-K class: try to stay quiet for one whole minute, just like during a lockdown.

"This shouldn't be something that we get used to," Cohen said. "We need to keep being jarred, upset and shook."

As Healey and Cohen talked to CNN, their daughter was cheerfully playing with Legos, unaware of how conversations of guns, shootings, lockdowns and fear have become so commonplace.

Lockdown, Lockdown

it's all done

Now it's time to have

some fun!