DF wants to4a pirate theme in his bedroom, cute little pictures of smiley faced knife wielding murders. Lol
Now you've bought out the historian lol.
Caribbean pirates (who are the pirates we think of when we think pirates) tended not to murder the crews and passengers of captured ships because if people know they are going to die they tend to resist fiercely. They also had very democratic communities at a time when slavery was common and most people were excluded from voting.