I am posting this topic because I am having trouble GMing my own Dark Heresy campaign. I have been GMing most of our group's campaigns (Warhammer Fantasy, Deathwatch, etc.), though I am beginning to resent it given the level of hostility that could result. Part of this involves me having to argue with other players about specific rules and how players tend to exploit certain aspects of the game though I try to disallow it. One of these instances includes a player being able to disarm an Ogryn who was wielding a power-fist. Though there was no specified rule on this weapon being removed, I was skeptical by the fact that he should have been able to achieve such a feat. Another incident had been where players would just roll dice and then declare exactly that they were going to do once the roll was favourable. This sometimes involves players rolling dice without me looking at the result and become suddenly offended when I want to see. Some incidents had shown that one of the players had a bomb detonate in their hand and they casually rolled without declaring and then suddenly re-rolled to show a less damage result. I know this is just a game and is meant to be fun, but it gets kind of old when a player suddenly succeeds on all of their tests despite their ability being at a low level. Another incident had been where players would complain that I make certain scenarios too hard (though it had been their fault for failing each objective leading up to the final conflict). Even the character personalities tend to create barriers as players would be at each other's throats because of some small incident.
It seems to me that this has made me not enjoy directing campaigns as much as I used to. Though these games are meant to be enjoyable, people take offense to when certain rules are unfavorable (whether I decide them or not). I do read the rules on several occasions to refresh myself on the combat dynamics etc. Another huge issue is that I am not as well versed in the 40k lore as some of the members and this often creates other complications revolving around hierarchy between the Mechanicus and Inquisition.
I thank you for your time in reading this and would like some recommendations on what audiobooks I could listen to in order to grasp a better idea of the sci-fi world. I am just running out of energy in creating this campaigns or even GMing them.