A user's guide for the people API

This is one of two reasons that people complain about Stack Overflow. When they close your question, the information they want to convey is, in most cases, some variation of "We're not a debugging service. If the answer to your question is not going to be useful to anyone else, then we don't want to host it on our website or give you free advice about it." Unfortunately, this is not the answer that most people want to hear, and until fairly recently, the SO user interface was rather blunt and unapologetic about it. The new interface is kinder but perhaps a touch less direct.[1]

The other reason is that, when you moderate a website for long enough, you start seeing new users break the same rules[2] over and over again. Some folks just aren't very good at managing the resulting emotions, so they sometimes lash out at newbies in ways that aren't very productive or helpful (it's entirely possible to close a question without insulting the person who wrote it). This is IMHO something the community needs to work on.

[1]: If you go looking for examples, note that a different version of the UI is shown to the post author than to the general public. Here's their blog post with screenshots: https://stackoverflow.blog/2019/12/05/new-post-notices-im...
[2]: Not just the "we're not a debugging service" rule. You also have e.g. "My code doesn't work" questions that do not include code, questions asking someone to implement an entire chunk of functionality from scratch, questions about the "best" programming language, people who think the site is a forum and you can just have a freeform conversation, etc.