By my experience, i'd say that some people target you to ruin your day.

[HoakinBlackforge]

Did they attack you without any sort of RP or warning?
I doubt somone would go out of their way just to kill you in New York, even more if they didn't see you killing NPCs or pirating players.A pirate transport can be quite annoying to kill from my experience with a nice armor upgrade ( i would like to make it clear that my experience is dying 95% of pvp encounters anyway). I'm not a pvp person, i'd rather leave the system if i get the chance, pay a fine, talk my way out of it or cloak out of range. I don't know if this helps, and i'm sorry if it doesn't or if it isn't the case, but if you were just looking for some NPC cargo and not much player interaction you could try something like cambridge or the omegas and steal some cargo from a passing gold ore trader.

-snip-

I follow the personality of my character, but i answer in ways that people can (almost) understand, like when i see a liberty navy ship, instead of "hello" i just say: I DONT LIKE YOU or WE AREN'T FRIENDS
I always wanted to try how roleplay works through a game, but if im going to find scumbags who just want to pvp, i could just bring a group of friends, and destroy literally anyone we see through "roleplay".

Well it may not be pleasant but if somone disrupts you , tells you to stop and you keep cruising i think they are more then allowed to shoot you if i'm not mistaken (excuse me for any grammar errors in there).
I think getting a group of people and start destroying every ship you find is not the best idea or attitude, if you feel you are too big of a target in a pirate transport you could allways try joining the Liberty Rogues or finding someone to fly with you using a fighter. You can allways try to use a freighter or a smaller transport too , will make it easier for you to survive but you will have less cargo to steal.
I'm sorry if i wasn't much help, i haven't played in Liberty in alooong time. I generally stay in Bretonia or independent systems.

I just find absurd to kill a player who hasn't done anything and doesnt even has cargo, its like The Wild ID was made for: "Find people, kill them, enjoy their salt because its how your ID works".

Also this character of mine is a liberty rogue.

Just... really?