It doesn't benefit FDev to tell you where the line is.
Unfortunately I've run into this exact problem in smaller communities, and there's a special kind of player that demands to know exactly where the line is and will lawyer to the high heavens about the technical details when they do something that aggravates literally everyone, arguing that whatever odious thing they just did is technically allowable.
My usual solution has been to laugh at them and boot them out anyway. If you have to go around asking what the maximum amount of a jerk you can be before you get kicked out, then...
Why would I want someone around whose intent is to be as big a jerk as they can get away with?
This is why nearly every squadron or discord, where they have rules, will have something to the effect of "if you play stupid games then you'll win stupid prizes" to head off that kind of rules-lawyering.
However, when fees are involved (such as... well, buying the game) it gets a little trickier and the last thing they'll want to deal with is some jerkass being all "HWELL ACKSHUALLY UNDER PARAGRAPH 34 SUBSECTION A YOU DEFINE DISALLOWED TERMINOLOGY IN COMMUNICATIONS AND I THINK YOU'LL FIND THAT I WAS CALLING THAT OTHER PLAYER A MEATBALL IN SYSTEM CHAT THEREFORE THIS BAN IS NULL AND VOID"
While I agree with you in spirit, the world where everyone just knows to “do the right thing” doesn’t exist, whether in real life or virtual. Operating with rules that are purposely vague relies upon the one in power truly being fair at all times, and applying the rules equally to all parties. Defined rules must exist so that those in power can have some limits in how they apply them so that those without power can have some recourse.
Case in point, the example where you “laugh at them and boot them out anyway” makes me feel (whether true or not) that on at least one occasion you may have wielded your ultimate power more to stroke your own ego and less about it being the fair thing to do at the time.
I’m well aware that the less information FDEV provides, the better it is for them, and all the rules are vague in order to provide them with maximum leeway in their application. I just feel that it is wrong to punish people for things they do within the context and rules of the game, especially as this game has always been pitched as a cut-throat galaxy, without mercy, where anyone and everyone can be killed or wronged in other ways, at any time (within the game setting).
I did state in my post that maybe the reasons those guys were banned were for other things, outside the context of the game, and I hope that’s true. The scenarios I provided are not the way I play the game. Hell, I’ve never even ganked anyone, all the PVP fights I’ve ever initiated have all been consensual, but I wouldn’t want to see people that choose to play jerks get punished outside the game, no matter how big of a jerk they were. I’ve always advocated for a much stricter C&P system in game, where your choices matter much more than they do now.
With this being a virtual world and FDEV its creator, I would argue that it would be easy for them to put game mechanic limits on anything they truly didn’t want to be part of the rules (ie. station lasers and ATR). This would mean that anything within the intended game mechanics would be within the rules, and if someone does something with unintended game mechanics, they should at least get a warning to stop first.