Totally agree.
But for alot of folks, the rug rats are the carriers - and washing is probably pretty much a waste of good water.
Make a game of it, and wash hands with them.
I did this with my grandkids (we are raising two of them), showing them how to do it properly, and they have the green light to wash their hands at almost any time.
It really cut down on sick kids in our house.
Water (and soap) is cheap compared to having sick kids/adults.