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Yes, that's a rhetorical question.
If your children are old enough to play (apparently) unsupervised in the yard, they are old enough to learn how to clean up cat shit or avoid stepping in it.
Sheesh... maybe cat and dogshit in the 70's (when I grew up) was sterile, but occasionally stepping in it didn't kill any of us!
God forbid your children decide to ice you when you're in your 80s and crapping your pants!