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While I haven't experienced anything like what you describe, I sort of empathize. Last year at Thanksgiving I made a turkey, mashed potatoes, gravy, yams, etc. I divided up the food into various plastic containers to give to people. Yet, when I was going around, almost everyone refused because the food wasn't canned or factory sealed. Apparently some people in my area have been poisoned before from food donated by strangers. I ended up going home with most of the food since only two or three out of 15+ people would accept it.
It makes me sad, and I don't hold it against them for being suspicious. It's just so unfortunate that people seem to be growing more paranoid, for reasons that are justified but regrettable. It makes it harder to do something nice.
Perhaps it's just a matter of need at times.
If someone really needed, they'd be more than happy to accept what you offered, but then again, there is the matter of trust.
I am sure I get that too, as their life is fairly complicated by predators that regularly stalk their environment.
Since I grew up in the area, way back, I kind of understand and relate, and most of them know too, that I must be watched, but not messed with.
The irrational are my grief, the untrusting yours.
It seems you have a very good heart, just be careful, as the irrational pop up everywhere, and it seems even more often than they used to.
Merry Christmas, and best of luck in what you are doing.