There's no judgement of people in my comments. It's objectively bad. Air and Water are 100% things we should protect with law BECAUSE "This planet is a shared resource".
I don't have a lot of concern for what I walk on. It can be raked or swept, watered if needed on concrete if it's a concern. On grass or soil it just creates more favorable soil. I take my shoes off at the door, so I don't see any issues.