I have absolutely no concern for the race of any of the people involved. For a crime like this, regardless of race, I would happily get out the needle-nose pliers, the Drano, and the electric drill with the concrete bit. If even one of these bastards ever sees daylight again, it should only be long enough to kiss their ass goodbye before they eat a .50 caliber slug.
Your response is little different that the crime in question. Execute them quickly and humanely if the jury decides to, and do it knowing that the final justice is left to the Almighty.
Hate the crime, punish the criminal, enjoy neither.
God Bless
Molon Labe