I must say that even though you shouldn't share this with your kids....I would without a doubt, if I saw who did it, take the crap to their house and put in on their front porch.  I always see people with bags when walking their dogs by my house, but then again, there always ends up being crap somewhere in the yard.  I live on a corner and I think people think the edge by the road doesn't count as my yard.  I feel your pain, but unless you catch someone, you just have to take it. UGH!

I had a neighbor whose 3 dogs would crap all over my yard all the time.  I spoke to them about it and their attitude was "so what?!"   I finally reached the breaking point and put all that crap in their driveway.  Their dogs were never in my yard again.