I've heard this a gazillion times-
He'll get his!
What goes around comes around!
Karma will get her!
Most of the time this sage wisdom is from someone who is angry, annoyed, or generally pissed off. The aggrieved party states that the source of their aggravation (the aggriever?) will suffer for their sins. How? By karma, the universal law of morality (click here for full description). I have heard this kind of sentiment from a wide range of folks from theists to atheists. The theist will explain it as God's will while the atheist will say that it's a Moral Law of the Cosmos akin to the Law of Gravity.
Not buying it.
The theist is the easiest to answer: No Evidence of God = No God = No God's Will = No Karma.
Done and done, thank you very much.
Atheists come in a broad range of beliefs. That may come as a surprise for the God people who read this blog (don't laugh there are a few) but it's true. There are atheists who believe in ghosts (Atheist Revolution did a post about this - click here to see it), atheists who believe in ancient alien visitations to Earth, and atheists who are skeptical and follow Carl Sagan's motto: Extraordinary claims require extraordinary evidence. I am (unsurprisingly) in the last group. The only characteristic one needs to possess to be an atheist is not believing in God or gods.
I have seen nothing that would prove karma exists. You may say, "What about criminals who are in jail? They did something wrong!" Maybe (there are convicted criminals who are innocent), but those are either the criminals who were stupid or just unlucky - of course they are the ones who get caught. There are many, many evil and successful individuals who will die asleep in their beds when they are 90 years old. These are the smart and lucky criminals. There are also the smart and lucky sociopaths in business/politics/everyday life who have manipulated the system and never had to break the law.
Oh, the atheist/karma believer may retort, "The scoundrel will get theirs in the next life," (yes there are Atheists who believe in reincarnation). However, that seems as likely as the evil going to Hell. It's the same equation minus the God: No Proof = No Reincarnation.
For some atheists this karma stuff is a hold over from their God days. As someone who once was a God guy it took some time for me to wrap my mind around this. Think about it. A theist goes from a Just Universe, even if that justice is delayed until the after life, to a universe where people are responsible for forging justice. Ick. It's like (to paraphrase Lincoln) the bottom falling out of the bucket. It's that bad. Karma is a way to salvage the just universe while getting rid of God. Unfortunately, karma makes as much sense as God.
So what's a person to do?
Control the things you can control,
educate yourself about the important issues,
let your voice be heard.
this is Purgatory.