Yes, this is exactly how I believe I'd have experienced it. Having a bunch of generic platitudes plastered around the school would have ramped up the "holy crap, are adults ever clueless" cynicism that I was pretty thoroughly mired in. It's the kind of thing that might have retrospective value, looking back on it in my 20s, in a "well at least they tried" kind of way.
In an immediate sense though, I imagine my friends and I would have turned it into a running joke by making more post-it notes that accentuated the absurdity. Like leaving notes in each others' books that said something like, "Good job opening this book. We're SO proud of you!!" Or coming up with the most exaggerated way to make fun of why we found it absurd.
I wonder if teenagers who live far away from these incidents actual feel like they're "in the wake of crisis" though? I can understand the value of biophilia in the wake of crisis. When there
were truly jarring moments in highschool - such as friends dying in a car accident, a friend losing one of their parents to cancer, etc - there was a sort of group softening that happened in which connection was more accepted than challenged, and a kind attitude from an adult goes a long way. But I'm inclined to think these school shootings are far more concerning to parents than to kids who have never dealt with it. Like the parents are doing this more to comfort themselves than the kids.
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Without talking to either team here, I obviously really can't say. I'm just forming my opinion on what I assume my own experience would have been. And I remember the annoyance of dealing with adults projecting their fears into me and/or assuming they know what I'm experiencing (just because THEY are experiencing it). The whole idea of it sounds like the plot of a South Park episode, which typically portrays how the adults are "doing it wrong". It was a big pet peeve to deal with an adult (or even a peer) 'needing' to comfort me as means of actually deriving some kind of comfort themselves, like I'm just a warm body they're using to process something of their own - without actually helping me experience what I AM experiencing, or even acknowledging it in the first place. But I know I'm on the fringe for always having had a modicum of patience for that kind of thing. So that's why I opened the question here, to see if most others (particularly those who are younger) actually would have found it helpful. It's interesting to see comments here find it more positive than not. Apparently I was even more cynical than I'd thought.