[ronda]

I agree it is not considerate to drop poop bags ; but think about it. If the person is considerate enough to bring bags and pick up the poop (which everyone should do out of respect for others), does it make sense that they would just drop the bag? Why even bother picking it up then?

Unless you see this in the same area, over and over, I would assume it's a one-off. Something unusual happened that day.

"what would you do?" My advise: Pick up the bag, throw it out and get on with your day. If after that, you are still looking for something to get angry about, turn on the news.