[souplesse]

I think that's exactly the point the parent comment was making: that, as with driving, an individual who is unable to take the wellbeing of others around them into account can/should have their privilege of individual autonomy restricted.

Obviously there's a difference between defecating on the sidewalk and recklessly injuring someone with a car, so the question becomes how we define harm.

[ryan_lane]

Homeless people generally wouldn't defecate on the sidewalk if they had bathrooms to use, so even that point doesn't stand.