i hate to use the "slippery slope" fallacy, but well... it is. where do you draw the line? in Montana, where i live, a Wal-mart employee recently shot another when they got in an argument. the state had recently passed a law similar to Florida's "stand your ground" law, and he claimed he felt his life was in danger (even though they were both at work, in Wal-mart...). who's to say if he was right or wrong? all i know is someone got shot at Wal-mart over a stupid disagreement and a potentially dangerous law, setting an even more dangerous precedent.
granted, in Baker's case, his life was more clearly in danger, but shooting him 4 times seems excessive. idk... not gonna pass judgement here. on one hand the mugger deserved it, but i just see this leading to bad things.
*edit* relevant information i forgot to add: the case i cited in Montana? the "assailant" wasn't armed, or even threatening overt violence. he was angry, and he was physically larger than the shooter, and that was deemed sufficient cause for the shooter to fire in self defense.