They were actually all acquitted by a lower court years ago and the prosecutor had to appeal to get a guilty verdict this year.

I believe there was some technicality that made proving intent difficult - the original contract was vague enough that the defence could argue that killing was never the plan and they only wanted to intimidate the victim enough to drive him out of town, and somehow the message got distorted down the chain of outsourcing to become a hit which was never carried out anyway.