I havn't read all the replies, so I hope I'm not retreading too much on the discussion.
I think people maybe push back on rape as a plot point because it's one of those life events that utterly changes most people. Readers that see it used to motivate a character into action or in some other way treated as less shattering than many people see it, it can feel tropy, misused and inappropriate.
I personally think, like any aspect of humanity, it's fair game for being included in a story. I just think like any other serious event, it's inclusion needs to be earned.
The character affected needs to feel the weight of the event. Like you said it needs to not be glorified per-se, though like in Clockwork Orange, you could argue sexual assault was "glorified" but only because we're supposed to be seeing it how the protagonist sees it.
I think what people push back on is more the "casual" inclusion of the act when it's one of the LEAST casual acts imaginable. If an artists wants to include it, I think they can. They just need to be READY to include it, and if they're not sure, then I think they should assume they're not ready to tell that story. just my opinion on it.