Here's a good illustration of why a lot of people favor concealed-carry laws.
Two thugs burst into an internet cafe in Florida expecting to steal money they know to be there for the taking. What they didn't expect to be there was 71 year-old Samuel Williams armed with a .380 semi-automatic handgun. Mr. Williams rose from his seat discharging his weapon in the general vicinity of the young miscreants, and teaching them a lesson about the wages of sin. Both were later apprehended and hospitalized with non-life-threatening injuries. No charges will be filed against Mr. Williams:
More details of the incident can be found at The Blaze.