Why does no one clean up after their dog?

Went for a walk in mungret park the other evening and was shocked at the state of the park. The paths were covered in dog shite! Couldn’t even let my dog walk on the grass because there was shite all along there too. Actually disgraceful the amount of irresponsible dog owners. Tried so hard to watch where I was walking but still had to wash my shoes when I went home. How is no one cleaning up after their dogs??