Your definition of white-collar crime is way off the mark. White-collar crime is real crime. Fraud, embezzlement, and money laundering are not "loopholes around laws", they are crimes just like murder, larceny, and rape. The government brings prosecutions all the time, and there are plenty of white-collar criminals in prison and paying hefty fines.

The absence of violence (murder, rape, assault, robbery, etc.) or physical force against property (burglary, grand theft auto, etc.) is what defines a white-collar crime. They involve abuses of trust. "White-collar" just refers to the fact that people in white-collar professions are typically the ones have enough power entrusted to them to be able to commit these crimes.

Of course, there's no perfect taxonomy and you can argue all day about whether a particular crime is white-collar or blue-collar.