Yeah, I totally agree that more would need to be done in the area of prevention (I wasn't joking!
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I was seriously thinking about this 10+ years ago already.. Some stuff has been done worldwide already, school-wide anti-bullying, mediation programs etc... Thing is (an ex-roommate once said) that on big schools in big cities there are A LOT more problems, those schools may have bigger budgets and do more, have more programs... when even smaller things/programs could do a lot on smaller schools/in smaller towns...
Also, for teachers, it is kinda impossible to actively develop programs & teach at the same time - the programs would need to be prepared ahead... ideally incorporated into other lessons (eg language, nature, home economics etc maybe)
health and mental health are complex things, also food/nutrition and environmental health/problems can play an important role.. and yup alcoholism and such.. again, some towns/cities may have Al Anon and AA programs, some don't... our country is quite 'famous' for alcoholism and suicides too, sigh..
it has to be well thought-out and made together with teachers & experts, so that it wouldn't inadvertently cause damage.. ideally it would be a whole-school approach, even the staff (eg a cleaning lady or a janitor/maintenance guy or a cook) can sometimes help a kid..
I mean, why don't kids at school learn about Really Important Things, like Life/Love/Career/Money management etc? In times of Google and Wikipedia, more emphasis could be put into information/overwhelm management etc too... A lot of things that would be important in school.. Also important, who teaches such things and how.. Teacher burnout/overwhelm is a big problem too, in some schools/subjects it can be worse than others..
So teachers aren't really happy about any 'extra work', at least around here lol.. unless they have taught for a while and experienced in basic class management etc. Then they may be interested in more too..
Teacher education at universities would need to be different already, and teachers offered the help and basic skills (eg CBT and some common 'traps' for teachers explored, and what can be done, etc.)
Often, conflicts can arise at school, and teachers may not have the knowledge how to deal with that.. Good mediation programs hence offer support for teachers too..
It's not 'enough' to just 'get informed' about eg anxiety etc - really prevention is imo learning how to prevent it so the kids wouldn't need to get to a therapist, or less would need to go..
Therapists are just 'firemen' putting out fires... The ideal is that people learn to live in healthy ways and such crisis problems wouldn't happen.. Or yeah, that they would know who to go to and what can be done..