Hello, the difference between a pirate and a non pirate is negligible
For example known pirates seem to have basically the same rights as everyone else. They can send and recieve ISK, they can use the market browser in high sec, dock in any station, set up structures in high sec so on so forth.
Why is that?
Dystopian future.
One person’s pirate is another person’s freedom fighter. 
Just like in real life
Maybe they paid Concord 40m ISK ( or more ) to f̶i̶d̶d̶l̶e̶ amend their security status.
See at least someone understands why we support Princess Aiko
The game software answer is pretty obvious. It would require a lot of rework to game mechanics and the database. It would be almost like reinventing the game.
@Uriel_the_Flame said the true answer about pirates historically. When British was at war with Spain, France, etc. any “pirate” attacking British ships were welcomed by their enemy countries. Very few pirates made enemies on all sides. The Gentleman Pirate ( Stede Bonnet ) was wealthy landowner. In 1717, he met up with Blackbeard in Nassau and they both attacked various merchant ships. Unfortunately for Bonnet his men turned their loyalty to Blackbeard viewing him as the better pirate. Bonnet was pardoned by North Carolina governor and was allowed to undertake piracy against Spanish shipping interests.
If the game was redone in such a way, players in pirate factions who attack only Amarr and Caldari ships, would be welcomed by the Federation and Minmatar.
Fly safe o7
Pirates are not allowed to mine.
Ganking is not a hard activity in New Eden
It takes greater skill to mine ice or ore efficiently where ganking can be achieved on a one day old omega status pilot.
One is a dumbass and the other is just dumb.