I do boggle at the mentality of anyone who would go to the bother of scooping up dog waste, putting it in a little plastic baggie that they’ve brought with them for the purpose, and then leave it lying around.
I mean, either you care or you don’t, right? If you do, you dispose of it properly, if not you leave it as nature intended, in the middle of the footpath for dispersion by chidren and cyclists.
I can only assume that perhaps naiively they think they’re doing the right thing. The levels of stupid that some people are capable of no longer surprises me.