Smokers

I just came back from a little walk around campus. As I was approaching the building I noticed a lady smoking outside. She flicked her cigarette butt near a pile of dead leaves when there was a cigarette butt trash can about 10 feet away. I wanted so badly to say something to her, but I didn't. Is it complete laziness or lack of care for everyone else (someone has to pick that up when they clean up the outside area) or just pure stupidity? I just don't get it.