I respectfully disagree. Those idiots had everything coming to them they got. They got off very lucky, actually (lead in the ass of one and a flesh wound on the arm of the other).
After reviewing the evidence, the Marion County Sheriff's Office felt that Mr. Williams used justifiable force and would face no charges.
Stand Your Ground, baby, Stand Your fecking Ground to punks like this.
Edited to add: it was God's Plan ;)
If captain vigilantepants really had the balls to take these 'punks' on, he could have done it when they weren't running away.