When a multi-million dollar prison's built, politicians awarding the contracts make or meet favors, building contractors make a profit. Food and clothing suppliers meet their bills, because of those who prey on society. Guards and wardens live comfortably because they're paid well to preserve society's predators alive. Police, prosecution and defense lawyers, judges, bailiffs, court reporters, bail bondsmen and janitors all profit from crime. If criminals were forced to serve their entire sentence, keeping them out of circulation for years, instead of months, employees of the criminal justice system would suffer dramatically.
Habitual criminals commit crimes while out on bail, and especially while on parole.
Those who arrange their freedom before and after serving sentence, have a vested interest in their liberty to commit crime. Consider his profit to the criminal justice system. If he continues this career path, he'll represent millions of dollars. He's a gold mine, except to those he robs, rapes, maims and kills. The tragedies he and his ilk leave in their wake are a small price to pay for job security, legal fees, and career opportunity in the criminal justice system.