Some of the "real therapy" happens when the initial shock wears off, Olbrich said.
CNN: Finding 'new normal' after school shooting
The community still remembers the event but has largely moved forward, Olbrich said of Columbine.
"If you mix those groups, there's a risk that the stories they tell could actually re-traumatize kids who didn't see that, " Olbrich said.
In Columbine, the demand for services related to that shooting hit its peak a year and a half after the shooting, Olbrich said.
Olbrich and his colleagues ran several support groups after the shootings at Columbine High School in 1999, still the deadliest event at an American high school, in which 12 students and a teacher died.
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