Routine activity theory says that crime is normal and depends on the opportunities available. If a target is not protected enough, and if the reward is worth it, crime will happen. Crime does not need hardened offenders, super-predators, convicted felons or wicked people. Crime just needs an opportunity.
Another premise is that crime is relatively unaffected by social causes such as poverty, inequality, unemployment. For instance, after World War II, the economy of Western countries was booming and the Welfare states were expanding. During that time, crime rose significantly. According to Felson and Cohen, this is because the prosperity of contemporary society offers so much opportunities of crime: there is much more to steal.
Routine activity theory is controversial among sociologists who believe in the social causes of crime. But several types of crime are very well explained by routine activity theory including copyright infringement, related to peer-to-peer file sharing, employee theft, and corporate crime.