Now that you've explained the subtle (and poignant!) connotation of "ex-junkie," I really like it. I think that you should definitely keep it in, if you can make the distinction to the reader (ie., those who, like me, didn't realize the different labels for mainlining versus other use). Here's the passage in question:
she's doing heroin every afternoon now with Tamara, an ex-junkie ('ex' because she no longer shoots up) who places the accent on the second syllable of her name and expects everyone else to do so as well.
First off, that's some really effective characterization, and in a very compact form. But maybe you could rework it a little to help clue-in the reader:
she does heroin with Tamara every afternoon. Tamara puts the accent on the second syllable of her name and thinks she's an ex-junkie because she doesn't use needles anymore.
Well, that's far from perfect, but you get the idea. In any case, I think that you can omit "expects everyone else to do so as well" because it's sort of implied, if that’s how she refers to herself.
Anyway, I didn't really mean "preachy" in a proselytizing or theological sense, but rather that the tone is a little too pushy or aggressive in conveying the narrator's feelings:
My family would call me cold-hearted for making someone else's death about me. I openly admit having prayed for this day; it's renewed my faith that there might be, despite all evidence to the contrary, some sort of benevolent deity out there in the universe. Not because I'm spiteful, but because no more lives will be ruined, or derailed. No more parents will look the other way, no more little girls will be turned against themselves and be taught to hate their own reflection; not by his hand, at least.
There's a desperation or urgency that doesn't quite ring true, as though she's trying too hard to convince the reader, and as a result the impact of the passage is compromised. But it's powerful at its core; if you can strip it down closer to its essentials, you'll have a really strong sequence.
Consider something like this, perhaps:
I've prayed for this day, and now that it's come I can almost believe that someone's watching out for us after all. Maybe it's shallow to use someone's death to prop up my view of the universe, but it's even more basic than that. He's dead. No more little girls turning against themselves, hating their own reflections. No more parents looking the other way. No more lives ruined. Not by him, at least.
Incidentally, I think that you should give the pimp/pusher a name, or even a derisive nickname, so that you're not always referring to him as "him." Put it in the first sentence of the piece:
"They found Roger on his knees" or whatever you want to call him. Thereafter when you refer to him, there's no unintended ambiguity. Also, I just noticed that there's a bit of a disconnect between the first two paragraphs and the third. It's not quite clear that Roger's (sic) death is the one that you're talking about, and it's not quite clear that Roger is the jerk who ruined those girls' lives. That would be eliminated by naming him, and the reader's focus can stay on the story without having to figure out which "he"did what to which "her."
One final note—although I wasn't really thrilled with the term "un-Christlike," I can see that it's sort of apt in an ironic sense, since his death
does sort of free the girls who would otherwise have continued to suffer. But I'd resist the insertion of explicitly Christ-based imagery if only because it's a little too weighty for what you've already got going on here. Let his death, and the subsequent "freedom" of the girls speak for themselves.
There's a definite cathartic vibe to this piece, as though you're getting rid of something that's been festering for a long time. And that's an entirely appropriate exercise to undertake through fiction! The only caution is that, in achieving your release (whatever it be), don't overplay it at the expense of the story or the reader. Let it out in all its ugly fury in the first draft, and then work from there to achieve the final piece. Of course, that only applies to cathartic writing that you intend to share or publish; if you're writing for your own sake, let it rip!
Thanks for sharing this. As has been said several times in the thread already, you've got a strong story that can readily be worked into something of real power. Please post an update with your progress, if you care to do so!