Yeah, I have those eyes, and I am not pure evil. Unless I haven't had my coffee.
I'm not offended by the 'pure evil' thing. I just think it's also possible that the victim *wanted* a shot of heroin and not being a hardcore habitual user, promptly overdosed. Maybe she realised it, maybe she didn't, during the time he was actually dying. It can be hard to tell.
It's also pretty common for heroin addicts to abandon people who are OD'ing. I saw a young man OD once. As I reached for the phone to call the ambulance, his best friends - since grade school! - who were all on heroin too shouted at me to put the phone down -- they were going to carry him out to the kerb and leave him there. Of *course* I called the ambulance.
I have watched good, honest, loving kids, with excellent families, excellent grades, end up like this girl. They did not have faces like that before the drugs. But they sure did, a few years later. They did things I could not *believe* -- just sick things, bad things, like they'd lost all their conscience. They robbed their parents, their friends, they were just monstrous. But before the drugs, they were not that, at all.
That's why I reacted to 'pure evil'. Maybe she isn't. Maybe she's just a junkie. That's what they look like. That's how many of them end up acting. But they were not always that way.