What is your opinion on the morality of this point of view?
Fine, I'll answer my own question, then. I could be wrong, of course (and I suspect that I am, but that's a different discussion). What is my opinion on the morality of that (the Straight-Edge) point of view?
Hmmm... well, I always think about this. Like, if you drink a beer only once in a year, like you drank a can of Budweiser in February or whatever. But the rest of the year you're sober. Have you broken edge? Some people say yes, some people say no.
I'm on the fence on this one. I can't decide. Both options seem morally equal to me, even though they're mutually opposite. So, using the D&D Alignment chart, I would say that if your character in a (potential) video game is a Straight-Edger, then that character has to be True Neutral. Think of it like they're Druids in 2nd Edition D&D. Morally, Straight-Edgers are like Druids, that's my answer.
Edit: This is not to say that the D&D Alignment chart means anything IRL. But it does have a few things that make it interesting from a philosophical POV. For example, pop culture distinguishes "Good VS Evil", but it doesn't distinguish, like Immanual Kant does, between three types of moral actions: Good, Neutral, and Evil. What I'm saying is, D&D has more in common with Immanuel Kant's ethical theory of the categorical imperative, than it does with brain-dead pop culture theories of morality.