Divorce, Child Custody, and "Bad Mouthing" Your Spouse In Front of the Children

Divorces are often emotional, traumatic experiences for adults. And divorces can be particularly traumatic for children of divorce. If you are going through a divorce, what can you do to make it easier for your children?
Child psychologists and other experts have written extensively about this topic and offered many solutions about how to make your divorce less traumatic for your children. But in this post, I simply want to focus on one good idea: Do not disparage, or "bad mouth," your spouse in front of the kids!
As divorce lawyers in Augusta, Georgia, we generally recommend to all divorce parties to include such language in every settlement agreement or parenting plan. We simply want to encourage everyone, (including your worthless spouse, "Sluggo"), to agree not to talk badly about their ex-spouse in front of the kids.
Isn't this a good idea? Is it so hard to follow, for your kids' sake?