Thank you for the explanation: I can see your logic. Perhaps I'd make a difference between dumb but potentially honest questions and malicious questions. Examples:
How do I run a Perl program in my browser?
from vr00m: how do u write a web site, b!0Tch3zzzzzzzzz!! suck it down
Unfortunately, they're not always that obvious.
In my opinion, dumb questions don't deserve reaping. Questions from a poster who may not have read the manual don't deserve reaping. Questions that may potentially be homework don't deserve reaping. Questions that produce good discussion don't deserve reaping.
Granted, in this case several other people agreed with the delete vote, but I suspect there's less of a mental hurdle needed to decide to reap a node after it's already been considered.