What about when the intent and actions of one individual affects another? For example, what about when an adult sexually molests a child? You could hardly argue that the child's intent and actions, even if some of their intentions and actions are bad, are deserving of the suffering the child goes through. And child molesters are sometimes successfully prosecuted and sometimes not. For those molesters who are not tried and convicted or even publicly accused, how is it that they suffer for their actions?
Or let's take the case of serial killer John Wayne Gacy. Sure, he was eventually caught and punished for his crimes, but what about all the young men he killed? What terrible intentions did they have or what deeds did they commit that justified the bad karma of being murdered and buried under the concrete slab in ol' Johnny's basement?
And what about Martin Luther King Jr.? He had undeniably good intentions and committed undeniably good acts. And what was his Karma? He was assassinated for his trouble. So no, I don't believe in Karma.