defecating in open is disgusting to other people, but its natural and is not as bad to the environment as throwing a cigarette bud or plastic in open.

perhaps you've never vomitted from the smell of human excrement encountered on the way home from the train station

It's natural in the woods, not in a city.

agreed. except for dogs ;-) it's okay in city.

I don't think many would object if all dogs could learn to poop in toilets. So even in the case of dogs it would be preferable if they didn't do it outside.