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It's not a shame to feel the sudden urge to take a shit. What's a shame is blaming people for feeling the urge.
> There is no world in which a healthy person must shit on the street.
Healthy people are not the only ones a city must be designed for. From Wikipedia: "About 10–15% of people in the developed world are believed to be affected by IBS."
And note IBS is not the only reason to feel the sudden urge to take a dump.
You probably need to take a class on improving your poor reasoning skills and as another poster said: seek mental health care.