False dichotomy. It's not like you can only tell the poster one thing. There are questions on SO where someone says "this is how you fix your problem. This is how I figured that out. Here are some good docs/articles/etc. on this topic."
Both pointing out the problem with the code/methodology/etc. and helping them see something from a different perspective so they do better next time are valuable educational goals, and I don't understand why so many people think SO should address only one of them. It's almost as if people think coding problems are OK, but helping people with more amorphous skills is either beyond or beneath them.
Troubleshooting is a skill that can be taught— having someone more experienced giving you advice is an invaluable asset when you're trying to learn how to do it. Refusing to help people because they don't already know how to do it themselves helps nobody.
It's almost like you need to pivot the question at that point to be "how do I isolate problems?" or "how do I debug?" because the asker lacks those basic skills needed to ask a good question.