students who take a weapon with them to school, impact welfare & performance of nearby students just because they are aware of that [1]
[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1414751/
[1] https://apadiv15.org/wp-content/uploads/2019/02/Reducing-Wea...
go figure the plot you have to live after an event of this type