Danny would never tell anyone, but he has a sliding scale for what he considers worst criminals ever, one being 'I am gonna put you away for your own good' and ten being 'I am going to put away forever, preferably in Wisconsin where prisoners have no problem dealing their own brand of justice.' Molesters, rapists, murderers stay firmly at number ten. Drug dealers usually hang around seven/eight. This time though, they are pushing the nine/ten range. They took innocent children hostage to blackmail Five-0.
Castillo was damn lucky that the kids were found alive or his second arrest would have been completely different.