This is an opinion piece but I find it pretty convincing. Basically it's arguing we know how bad social media etc. is for our kids. And while school shootings are scary, they are statistically extremely rare and even if one were to occur the idea of trying to reach out to your kid during one does nothing to help. Basically it's an illusion of safety and control for parents.
I don't think anyone here is a member of Gen Z. We all somehow survived growing up and going to school without a cell phone. I think kids can survive the school day without spending their time on Tic Tok and other social media sites. I do understand the need to coordinate pick up rides and so forth after school/practice and having a cell phone adds a level of convenience. But on the whole, so much more negative comes from them than good. I see no issue with keeping them out of schools....
https://www.sfchronicle.com/opinion/openforum/article/cellphone-ban-school-shooting-18464820.php