To be fair, this can be an issue. Where I live, you put your garbage in a bag (it's about €4 a bag) on the street on Monday mornings. This means if I have a bunch of faeces-soaked stuff to get rid of on Tuesday I have to let it sit around my apartment for 6 days (I have a three week old child). I am not above tossing it in one of the neighborhood bins.

As far as the homeless, I'd much rather they use the bins than leave stuff lying around the street, even if I pay more in taxes. I definitely would prefer they would put the aluminium foil and lighters in the bin to the current approach of letting it pile up in any handy alcove.