Every weekend I would take my children to the park to smell the feces
That is quite revolting. Why would you bring your kids specifically to smell feces?
To teach them what the real world is like.
The fact is that how the real world is is something the parents don't need to teach kids - the world's got that covered. Your job is to protect them from as many negative aspects of said world, not torment them with it.
That's why I brought them to smell feces in the park to prepare them for what is ahead.
How you raise your children is up to you, but consider a better alternative to show them about the world than subjecting them to foul smells. You could read an educational book or watch an informative documentary to teach them about the world instead.