The irony is that Open needs more constraints (calm yourself Robert! Think of puppies or kittens ) to really make it function in a logical way and people take better care of themselves- that and form more structures that protect each other (such as squadrons, closer wings and so on) thus making groups advantageous.
People think it's a lack of barriers that give them options, but meaningful choice, and all the gameplay dependent on it, really comes from internally consistent constraint.
Not much of that to be had when everyone can play by their own individual set of rules.
That piracy is role play does not change the fact that it is parasitic, i.e. the pirate wants something from the target that they are not entitled to.
The gameplay such interaction provides is not inherent parasitic (everyone, except the most oblivious, playing in Open does so with the tacit understanding that they may encounter CMDRs that are hostile to theirs and if this was not desirable, or at least acceptable, they would not choose this mode) and everyone is entitled to whatever gameplay they can extract within the context of the rules.
The in-character interaction is parasitic, because it cannot be any other way. It's part of the setting, the experience, and even if one excludes every CMDR you encounter (which still leaves one with at least fifteen seconds to get podded, unless one actually breaks the rules to sever connection sooner), sooner or later an NPC will try to take one's cargo.
And whats the punishment for the Pirate who fails to interdict?
A long cooldown, where they are a sitting duck for those dropping into their low wakes...actually, that happens even if they succeed.
An old, but still valid, example (fast forward to 2:50 or so if you like):
Source: https://www.youtube.com/watch?v=512bytyifhw
My CMDR despised pirates, as he would often trade rares and dodging pirates made that a chore (for him...I enjoy the evasion gameplay immensely as a player), so in his off-time, he got in his FDL and shot them up. Piracy is a high-risk, low reward, occupation...to the point that it's outright immersion defying in the current game, for reasons Bigmaec has already elaborated on.
That's my point there is no risk for the pirate, the trader on the other hand has everything to lose, don't blame them for logging and blocking.
A silly assertion. The pirate has just as much to lose as the trader, and draws far more hostile attention. Every time a pirate attacks someone they are at the same risk of losing a rebuy and/or cargo as their target. A pirate vessel is just a trade ship with even less space for defensive equipment.
An example I usually cite with respect to the old 2.1 heat meta, but it was also a piracy attempt, and it's the pirate python that ends up losing cargo (at 4:34), not my CMDR:
Source: https://www.youtube.com/watch?v=EZ0Q-oZnXoY
My CMDR has been the target of pirates hundreds of times, has lost cargo once, has lost a ship to them never, and has shot down several dozen. At one point, that did constitute risk.