Lyric discussion by MZA 

Cover art for Our Ghosts lyrics by A Wilhelm Scream

I think it's about someone close who passed away, from an overdose on drugs (the arrows that poisoned your heart). The whole "I wont pass my judgements" part is probably related to the drugs as well.

The "shit talking committee" is probably everyone who doesn't know the full story or doesn't know the deceased as well as they think they do. This also strikes up images of the funeral in my head.

"I'll be opposed to every argument, Be ill to every lie, I'm not looking to be a hero, I'm not looking for a fight" means that he's not going to try to defend the deceased's drug habit against outside criticism or ignorance, not because he doesn't care, but because it's useless and won't change anything. And that's why he's "explaining [his] position to your ghost".

everything seems to fit, but i'm not sure about the drugs... i always saw the "arrows that poisoned your heart" as pointing fingers, saying negative things, or poisoning his purity/heart

I think you've got the right idea MZA, but I'm with Andiamo, what if "the arrows that poisoned your heart" are all things that lead someone to commit suicide? Perhaps it is about someone who OD'd. It'd make sense why he refuses to pass judgement.

But the second half of the lyrics (starting "the meaning-well, misguided talking shit committee gathers") talk about a different person, one who is metaphorically dead. The lines "Guilt pays off in full | Pay your maker" sound like the narrator is talking to a Christian adhering to the idea that they are guilty...