Hardly an absurd point. The boy Floyd was a convicted armed robber (mmm "gentle giant" perhaps not) sentenced to 5 years porridge in 2009. His karma came Monday of last week.
If you listen to the words of the song, the point is made well and truly within.
Wouldn't his Karma have been the 5 years in prison?
Passing fake twenties doesn't carry a death sentence, and even if it did that's not up to some cunt of a cop to decide.