"Stealing Soulstones and smashing them won't bother the Eldar!"

Okay, so. I need some ideas for how to explain things to these people.

The situation: in a rogue trader game with GM and his friend, whom is playing the rogue trader. I am playing a lawful-evil drukhari that subscribes to an incubus path code (generally believes in keeping their word, etc.)

Part of the drukhari's hiring contract terms is not to engage harlequins or khaine worshipers unless provoked (basically any eldar combatant is protected under this).

DM introduces a PR10 thousand sons sorcerer using black crusade+infamy rules, whom the RT invites onto the ship and takes into his retinue.

Now, this game is - critically - NOT supposed to be a pvp game, or so I was told. I explained I would not participate in PVP and would leave the campaign if they broke this rule, the GM answered me this would not happen without valid in-character buildup and good roleplay, indicating a stance of "if both players consent" which was fine to me, that was acceptable in principle.

Going into someone's quarters and planting a bomb to destroy their equipment is apparently not considered pvping or engaging them, as I found out later, because the team came into possession of an eldar soulstone - the PR10 thousand sons psyker then took the soulstone and smashed it in his hand in front of the drukhari.

The one that has an honor code about keeping their word. That one.

The RT asks later if he might be cursed, and the drukhari explains in-character that this is distinctly possible because he is A) working with a chaos sorcerer, B) that chaos sorcerer smashed a soulstone on the ship, and if the eldar (whom constantly use divination) find out, being undermined from the shadows is entirely realistic.

Drukhari also points out the soulstone-destroying thousand sons sorcerer was not reprimanded for his actions in any way and is being actively harbored by the RT which makes RT an accomplice.

The RT and chaos sorcerer get retired at a later point in the campaign, but not before doing something else - stealing a second soulstone and hiding this action from the drukhari. Rogue Trader says out of character "the thousand sons sorcerer asked me for it and it didn't cost me anything."

(the RT was retired because several players were frustrated with their decision making)

RT's friend, the GM, states later out of character that the party has negative reputation with the eldar (whom they have not physically encountered directly, the soulstones were recovered and destroyed/stolen via grave-robbing) because the drukhari is around, the one with contract terms not to engage eldar - not because of the two soulstones, this apparently has no impact on relations with eldar.

Also, RT's new character played by GM's friend oversaw the destruction of an imperial holy relic and did not take any insanity or corruption. Drukhari protested destroying relics and urged them to stop (drukhari's contract with imperials also includes clause about not engaging imperials without provocation, Other humans silent while Drukhari attempts to defend relic, Drukhari gets overruled by mission commander (RT's new character).

There is so much wrong with everything taking place here that I do not know how to begin piecing the lore back together... like what do I even say to these people at these point? I am not sure where to even start. Any ideas anyone??