Most PvPers started as PvE players. I did. I've done every PvE activity this game has to offer to a level and extent which would make the King of All Carebears proud.
Thing is, unless you have some kind of idiot savant tendencies, PvE holds no lasting challenge and becomes boring over time. It's just too easy.
PvP remains the only true challenge in the game for me. Going up against unfavourable odds and either prevailing or at the very least living to tell the tale is where the fun is for me. That having been said I'm not above ganging up on and destroying low threat CMDRs in badly configured trade ships.
Why?
Because the Elite Community contains more entitled fully grown crybabies than any other gaming community I've come across in over 20 years of gaming. Blowing up these whinging, whining, selfish players is immensely satisfying. But how do I know my target is one of these overgrown manbabies? Kindly this very forum provided me with the empirical evidence I needed to justify my endless murder spree. 70% of these awful wailing adult infants voted against instant ship transfer. A staggeringly selfish action which deprived the community as a whole of a massive QoL improvement, for which they can never be forgiven. It was an epiphany for me. These are the very same people who are now crying about their precious gimballed weapons being nerfed, and who complain that turrets should be an "I Win" button because they cost more than fixed weapons. They also howled about the AI buffs which came along with Engineers, and had the AI reduced to the rather unchallenging level it is now.
So, I can merrily go about my business destroying every CMDR I possibly can, because in 7 out of 10 cases, supported by solid empirical evidence from this forum, they had it coming.
I hope this helps