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A lot of the deeper gameplay elements in Eve are reserved for the players that can play in 0.0 space. This includes being able to manufacture stuff fullly from sratch (instead of having to buy the 2 minerals that only come from 0.0), having player owned structures, and being able to fight more challenging enemies, at least outside of missions.
However, the most repulsive part about 0.0 that makes it unfun for most players is the lawlessness. I'm not talking about the open style of PvP, but I'm talking about many different factors. Like how sec status is no indication of a player's trustworthiness (no sec hit for killing a player in 0.0, or killing a player in a group), warp core destabalizers are such an all-or-nothing approach, and it's generally impossible to control a system aside from camping the gate (once a player is loose in a system they can be downright impossible to hunt down), making gate camping the most effective way to guard player owned structures or otherwise defenseless ships, and the possibility that any unknown player could be scouting a system and making instas for a system so less scrupulus people can use them and make a strike force to threaten the people holding a system (again, making gate camping the most viable strategy).
If it was more possible to guage a player's trustworthiness, we might see more alliances not using the NBSI (not blue, shoot it) policy. And likewise there would be players that could actively hunt PC pirates and bring some order to 0.0 space. It wouldn't be safe, sure, but if security rating changes applied in 0.0 as well, it would be more informative and allow players to enforce the law. Likewise, there would have to be some means of hunting down pirates to keep them from escaping. Warping is too much of a magic teleport that doesn't tell people observing the warper where the warper is going.
In short, it's so much easier to harass anonymously and without retribution than it is to enforce any kind of order. There are not enough tools for players to interact with one another to make 0.0 safe even if they wanted to, short of the NBSI policies which only make the area safe for members of an alliance.