Why do people walk in the street with a perfectly good sidewalk right next to them? I bet a healthy dose of motor vehicle operators think the same thing about bicycles.

Why do people ride bicycles in the streets when there's a perfectly good MUP they could ride?

Are pedestrians forced by law to use the sidewalks where there is one, instead or walking in the street?

Why do laws and advice specifically state to walk against traffic, rather than with, if pedestrians are not entitled to the same use of the road as motor vehicles and bicycles?

Why shouldn't they walk the street? And what's it to you, anyway...?