Karma is awesome because you can use it to justify terrible things.
"Why did he rape me?!?" "Well... maybe you shouldn't of cut me off on the interstate last week..."
"Why did those people bomb my country!?" "I don't know but they probably had it coming..."
"Why was my pregnancy a stillbirth? :C" "Because you read Ctrl-Alt-Delete, bitch."
I honestly think that the views of "good and evil" in the world are entirely up to ones own perspective, and aside from a few big ones most can agree to, (Please don't murder other people) There are always going to be different views about what warrants karmic retribution.
"You're gay, so that's why you caught HIV."
Lol Karma.