In states with widespread gun ownership and tough punishment for gun misuse, criminals surveyed were often unarmed: 54% in Oklahoma, 62% in Georgia, 40% in Maryland, 43% in Missouri, and 35% in Florida. In Massachusetts, however, only 29% of the felon-respondents were unarmed. In that state, it is difficult lawfully to acquire a firearm, and the illegal carrying of a firearm, rather than the criminal misuse of a gun, is subject to the mandatory penalty. The survey data indicate that the criminals' fear of an armed victim relates directly to the severity of the gun laws in the state surveyed. Where gun laws are less restrictive, such as Georgia and Maryland, criminals think twice before running the risk of facing an armed victim; they are much less concerned in Massachusetts.
Fifty-six percent of the felons surveyed agreed that "A criminal is not going to mess around with a victim he knows is armed with a gun;" 74% agreed that "One reason burglars avoid houses when people are at home is that they fear being shot."
A 57% majority agreed that "Most criminals are more worried about meeting an armed victim than they are about running into the police." In asking felons what they personally thought about while committing crimes, 34% indicated that they thought about getting "shot at by police" or "shot by victim.
Taken from
NRA-ILA The Armed Criminal in America