Actually, I'm well aware that there have been a few space pirates across all the spinoffs. However, I read about Gambit on Memory-Alpha. The TNG Companion notes that Gene Roddenberry forbade space pirate stories from Trek. When the script for Gambit came along, Berman liked the script and the band of pirates so much that he tied a bandana over the bust of Roddenberry out of respect. And a few months ago, pirates off the coasts of Africa and Asia were very topical in the news. The idea of Starfleet patrols defending colonies and civilian craft would seem routine and timely. Over the years since Gambit, space pirates have been used to varying degrees of storytelling quality and success. But I still have to ask the question: would anyone know (or care to hazard a guess) as to why Roddenberry said no space pirates? Any discussion would be interesting. To note: I could see how the concept of space pirates could interfere with Roddenberry's vision of a unified, perfect human society, but that says nothing about non-human pirates.