Chaos is not an accident. Defenses in the NFL do not stumble into being aggressive, creative units whose sole purpose is to terrorize the opposing quarterback. Chaos is a conscious choice, a bold strategy that defensive coordinators have to fully embrace to truly reap the rewards that come with the inherent risk. There is not a defense in the league right now better at earning the rewards of aggression while minimizing its risks like the Baltimore Ravens.
Per Pro Football Reference, the Ravens blitz on 54.4% of their plays. The next-closest team to them is the Tampa Bay Buccaneers at 44.