Presumably because Piracy is a LOGICAL part of the Elite universe (and whilst PVP Piracy returns are low payouts compared to some) and a valid Career choice...
A player that's Pirated can see that, understand that won't resent that...it'll be a positive interaction for Both...or if not positive at least understandable..."I've got some valuable cargo...that guy robbed it"
A million miles away from a Random player Kill for no in-game reason...Can you REALLY imagine a Sci-Fi Universe in which large numbers of Pilots, spend some of their time running Passenger Missions...to fund a habit of hanging around Stations to blow up new Pilots? Of course not...its not a valid in-game career...its driven by something "out of the game" that causes individuals to get their pleasure from essentially "breaking" the Eliteangerous Universe...
Why would you consider your Valid actions (Piracy) in ANY WAY comparable to that...
AND YOU as a Pirate SUFFER because of it...LESS people playing in Open because of the GTA/WoW crowd...means LESS Piracy for You...not because people resent Piracy (most don't) but because they resent being blown up for no reason by a bunch of idiots...
Being randomly blown up by a psychopath is an entirely valid way of dying in ED. There are NPCs like that too, taking pleasure from the misery of others (and in game terms, these NPCs exist to force you to fight/flee or face a rebuy). Why should you expect player characters to be any different and only make logical decisions?
And why should I resent players doing their own thing and chasing away players who obviously didn't agree to the premise of the game mode I have chosen to play in? It makes absolutely no sense to blame them here. If I thought murder-hobos had no place in Open, I would blame Frontier for letting them do their thing, not the players themselves. The players are just like you and me, they are having fun in whatever way they can which is allowed by the game. You may not find waht they do fun, but there are also players who do enjoy the fact there are psychos which could just kill them for no reason at all. I'm one of them. Whenever I see a hollow contact on the radar, I love the fact I can't know for certain what's going to happen. Most of the time nothing, but the two times I was blown up without questions asked have left their mark and now I always get a little rush of adrenaline.
Sure it does mean ultimately I find less
clients, but I wouldn't want to play in an overly sanitized environment anyway, so I just accept the fact somebody's playstyle will impact mine to a degree. And frankly I don't believe griefers are the main problem for pirates. Back when the game was a lot safer and the definition of griefing was piracy (oh yes...), combat logging was already a big problem.
Also I see you've mentioned various simulation, Stellaris and EVE/WOW and somehow tried to compare their communities. I never played WoW so I can't comment on that, but I have played most space sims out there, I also used to be part of a virtual squadron playing AF and BMS,
and I played EVE.
And in your comparison, here is what you missed: of all the communities you have brought up, only WoW and EVE are MMOs. All the others communities were organized around small (therefore friendly) forums of users sharing their (mostly single player) experience and love of the games and organizing small session-based matches between friends where applicable. If there was competition, it was friendly competition. Stellaris is pretty much the same. Although you will find a lot of bitterness within its community between fans of 4x, fans of RTS games, and fans of the grand-strategy genre that crossed over from PDS' other titles, MP games of Stellaris are still played between friends mostly.
EVE, WOW, and ED to an extent, are
MMOs. Their communities are a lot bigger. Nobody can afford to be friends with everybody else, and there is naturally going to be a lot more toxicity as happens every time a lot of people are huddled together (ever compared country life and city life?). But even then, their communities are split into smaller groups within which you will find the same friendly spirit you have experienced back in the days of the old sim communities. But across those communities, not so much: there is a lot of shared disdain between Open and PG communities, a lot of shared disdain between reddit and the forumdads, and you yourself have made it pretty clear what you feel about players attacking others with no justification, in a game which doesn't prompt one for a reason before shooting another player.