Here's what I just emailed to a user who asked about the same thing:

I think people can pretty well figure out what the story is from the linked page and the HN comments. No?

There's a downside to spelling things out completely—it gets people out of the habit of doing their own work to figure things out. Admittedly it can sometimes be helpful for getting a story attention in the first place, but once it's on the front page, there's nearly always a good reason for that, and it's good to expect readers to have to dig a little sometimes to find it.

Edit: There's another aspect too. When a title uses language that isn't from the article itself, it typically departs from the article in ways that subtly reframe it into something it isn't. (This is also the case with many media pieces whose headlines are not written by their authors.) For example, the courtroom tone of the submitted title frames this story as a grave breach of trust and leaves out the (I'll be generous) equally important aspect that this is a Reddit shitshow and nothing about it can be taken completely seriously.

This is an important effect to avoid, and sticking to language from the article itself is the way to avoid it.