We do look at number of views and links to a post before deleting it. That's why a lot of questions that aren't really on-topic for Stack Overflow are simply locked instead of deleted. We're trying to clean up the site without breaking the rest of the Internet in the process.

> Can't we just edit the question to make more sense, if it wasn't clear to the mod?

Yes, of course. Anyone can suggest an edit to a question, whether it's open or closed. If you find a question and its answers helpful, go ahead and edit it. Flag it for a moderator to consider reopening when you're done.

Also, if you found a Stack Overflow question through a Google search, then it's not deleted. Deleted content isn't visible to search engines.