One road to insanity is waiting around for Karma to enact justice.
You could drive yourself demented keeping tabs on your so called enemy and schadenfreude is rarely a good look on anyone.
An alternative route is to realize that something bad has already happened to them.
That’s why they were so callous / angry / cold / mean / cruel / apathetic.
You don’t need to wish ill fate because it has already befallen them.
Hat tip to the school of life for the inspiration for this blog post.
Thomas Duggan 