Earlier you asked how we could possibly know that people are bothered, now you presume to know they aren't, can we not agree that in the abscence of emperical evidence (but an acknowledgement that in society in general that littering is not tolerated and is in fact frowned on) that it's wise to err with caution and bring tat brought to a site home.
;)
I could've put it as well as that if I'd been cleverer.
A shortened version of your plan might be a litterbin at each site marked "Offerings".
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