I assume the school got permission slips from the parents/guardians of each and every student who went on this field trip, just like any school does for any off-campus field trip. And if the parents gave permission, then I really see no problem with this.
(Although, yes, I do think that the person(s) who conducted this had at least some socio-political motives. Then again, few if any persons are purely altruistic.)
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