A great American once said an injustice anywhere is a threat to justice everywhere. The justification is that the person committing the crime has little to no value in civilized society and should be killed off, because the chances of the thief being caught are very low, so one only has a moment to carry out justice and create a deterrent to future thieves. In a country like America where people are very sensitive to property rights, theft is far more heinous than in other countries. If you’ve ever had anything stolen here and reported it to police, you’ll be frustrated when all you get is a shrug and a promise that they will “investigate”, which basically means do nothing. People get tired of that and take matters into their own hands.