To my mind, SCBs CREATE players exclusively focused on player-killing. Here's why...
Q: Do you think you might attack and try to kill another player?
NO -> Fit out a "non player killer" ship... which is basically anything other than carrying a full rack of SCBs.
YES -> Create a "player killer" ship - fit as many SCBs as possible.
Q: I'm flying a "non player killer ship". What should I do in this game?
A: Lots of stuff, except for fighting other players. I can dabble in exploration, smuggle, fight off NPC pirates, trade in rares or in regular goods, pirate NPCs, bounty hunt NPCs, etc. But stay the hell away from other players.
Q: I'm flying a "player killer" ship. What should I do in this game.
A: Kill players.
Q: I'm flying a player killer ship, but just got killed by another pilot in his player killer ship who had one more SCB than me. What should I do with the token 8t cargo rack I foolishly retained for "RP pirating" or picking up special things I come across?
A: Ditch the 8 tonnes of cargo space and fit another SCB, of course. Specialise more. Discard anything not absolutely focused on player killing.
Q: 95% of players just avoid me in my player-killer ship. The 5% that don't avoid me all fly player-killer ships in wings of 4, and kill me. What do I do?
A: Wing up with three other like-minded, fully specialised player-killer ship pilots.
Q: Me and my three friends wanted to have fun playing Elite, but all we do is fly around in a wing of player-killer ships, looking for other player-killers. This is getting really boring when there are no gudfites, which is most of the time. Why is this game boring?
A: Because you are flying in a specialised wing of player-killer ships in a game that is honestly not built around PvP gudfites, and your ships cannot do anything particularly well except kill other players. And if you DO get in a good fight, your shield cells are the key to victory... and you just used some up. So EVERY fight is quickly followed by a trip back to buy some more, before you are back to full player-killer effectiveness. God knows, you wouldn't want to meet other specialised player-killers with only 50% of your cells remaining.You're bored because your entire game has shrunk down to a very small and repetitive gameplay style, with a very limited loadout flexibility, probably in a small number of systems, and probably fighting against a very small number of like-minded, and similarly specialised, players.
Q: I'm getting seriously bored and frustrated now with Elite, in my 100% player-killer focused ship, with my 100% player-killer focused in-game friends. What's to stop me making life "interesting" and injecting some hilarious forum drama by just going ape, and killing every player I see?
A: Technically nothing. Don't forget to bait, goad and annoy people with comments about "salty tears", "care bears" and such. Perhaps some people will grow a pair and actually challenge you in battle if you kill enough Haulers, Sidewinders and Type 6 in systems where newer players congregate!