How were there so few arrests? Violent crime should always be taken seriously. Anyone who is aggressive enough to engage in a physical fight should be incarcerated.
Depending on the jurisdiction, violent crimes may vary from homicide to harassment. Typically, violent criminals includes aircraft hijackers, bank robbers, muggers, burglars, terrorists, carjackers, rapists, kidnappers, torturers, active shooters, murderers, gangsters, drug cartels, and others.
As a society we do not do enough about violent crime or crimes against property. Instead we waste time on various non-violent offenses and fail to keep neighborhoods safe and orderly.