I just hope it's a message to the community that trying to break into a car is NOT a good idea.
As for whether he should have been acquitted, I have not read all the details and cannot be certain (although I lean toward trusting the jury on this one). I do think that even if he encroached on their "comfort zone" and even if his actions triggered an aggressive response from the criminals, it was okay for him to defend himself against that aggressive response. I have seen far too many career criminals who go through the revolving door of our "justice" system; these were criminals and I don't mind seeing a few of them go through the one-way door of the county morgue.