diasdelasombra
i actually think a lot about how in the book louis does several things to minimize his guilt (and maximize his pleasure) when he feeds: he hunts alone, he starves himself until near-incoherence before killing, and he rarely interacts with his victims at all because (he explains) it becomes near impossible for him to kill them once he's developed a connection, unlike claudia or lestat who enjoy seducing and even befriending their victims.
in the book, he tells daniel that he would have killed him that night at the bar, but daniel caught his attention and his interest instead —then louis attacks him at the end of the book, but doesn't kill him, which imho speaks to the same "attachment" preventing him from going through with the kill.
in the show i think we see some of the same inclinations: he feels bad about the death of the salesman because they got to know him too well, he avoids killing black people because he feels closer to them, and after he decides to stop killing in e3, we only see the murder of the alderman (irrational from hunger, years of resentment) and the council members (ibid) and we know he kills strangers off-camera but always alone.
now he feeds without killing, something armand first introduces him to in the book, oftentimes being the one to step in and prevent louis from killing off the human he's drinking from. and we know armand was close enough to save daniel's life when louis took him home in san francisco.
all of this to say one take i like is that during the period when we meet him in san francisco, fucking and killing are two things that are strictly compartmentalized in louis' mind, which allows him to make some degree of peace with his sexuality, or that's how he thinks about it at the time. so i imagine the whole seduce random guy get him high feed off (and thus get high off) him and have armand there as both voyeur and chaperone ready to step in if louis is about to kill the guy in question might have been their usual practice together, while louis is probably still going off to hunt and kill random men in extremely violent ways but exclusively on his own.
i think whatever happened during that last kill of 2000 could very well have been the collapse of this careful division, though on what terms exactly and prompted by what exactly is another whole world of possibilities. i need answers i need season two and i need louis to get some therapy immediately.