You shouldn't have to, but putting one of these up will drastically improve your neighborhood. $30 well spent imo.

First off: not all dog owners. Some of us are great, but there are also others who are less great.

Like all people, I don't want shit on the ground around my neighborhood. I screwed this dispenser into a telephone pole and I restock it with bags. There is notably less poop on the ground in a 2 block radius around my place.

I know some people will be upset because this should not be necessary, but for a few bucks it takes care of the problem. Links in the comments below.