Pirates: are NPC Transports fair game?

[Irishacana]

Hey everyone, I was wondering what the official rules are regarding pirating NPC ships. I'm thinking of creating a Liberty Rogue or a Molly character armed with the Scylla Destroyer.

https://discoverygc.com/wiki/%22Scylla%2..._Destroyer

I have noticed numerous NPC ships laden with 4000 - 5000+ of cargo lately while navigating trade lanes. I understand RP with other players but what steps does one have to take to legitimately pirate NPC freighters? Is this considered alright by players or is this frowned upon? I mean clearly the local Navy & Police Forces will have something to say about this if they witness a player preying upon largely defenceless super-transports but for all you Pirates out there, is this something you do?

-Any references to relevant Pirating guides are always appreciated!