Because it's an attempt at an answer
Borrowing from Meta.SO

It's not a good answer by any stretch, but it does actually try
Q: Why did Willie Scott get on the plane with Indiana Jones?
A: Does anyone remember that Lao Che had refused to give up the diamond to save Willie's life? And when she finally got the diamond, she didn't bother to give it to him. If Lao wasn't a gangster . . . perhaps. But he was. And I don't see Willie going back to him. Not after what had happened in the Obi Wan Club.
Compare that to this -2 answer from the same question
A: After Lao Che got his hands on the diamond, Indy threatened Willie again. This time, Lao didn't give a rat's ass and told Indy that he could keep her. I really cannot see Willie resuming her relationship with Lao after that. And the moment Willie got her hands on the antidote, Indy clung to her like a leech. He didn't even have the opportunity to take the antidote until they were in the car, on their way to the airport.
How is this answer substantially different from the deleted one?
So let's go back to the NAA description
This was posted as an answer, but it does not attempt to answer the question. It should possibly be an edit, a comment, another question, or deleted altogether.
- It does attempt
- It's not an edit or another question
- Deleted altogether? Hmm...
Most of the NAAs I've seen on SFF tend to run into
- Wild speculation (often without sources)
- Pure commentary and/or rambling
- Unrelated junk
This is none of those. But what about "deleted altogether"? It's important to note here that NAA/LQP is not a super-downvote. If an answer isn't good downvote it. Downvotes hurt a lot more than deletion. And the system is biased against people who make poor scoring posts. If you want something gone because it's just noise that's what 20k+ trusted users are for (or, in the rare case of positive score answers, mod flags). To reiterate a point I made elsewhere
You're a long term user. You should know what a good answer looks like now.
If you're thinking "But, how can we find crap to delete vote?" there's a 10k+ tool for that.