First of all: post reporters are welcome to use the Contact Us form when no moderation is done on a post they report, and they would like an explanation.
@willmtaylor if you want an answer other than what I write below here, please do so via the Contact Us form.
In our rules, users are asked not to post anything that's "....obscene, vulgar, sexually-oriented, hateful, threatening, or otherwise violative of any laws." Strictly speaking, it's not (as far as I know) illegal to post a suggestion to get Apple Care then smash the item to get a refund. Such a hyperbolic comment may well be tongue in cheek. But regardless, my interpretation is that it's not a rules violation on this site.
There's nothing in the rule that prohibits suggesting illegal activity, but that doesn't mean anything goes; we would certainly take a look on a case-by-case basis. For example: if a user here suggested something that appeared to incite others to do something that would harm people or property, or be considered harrassment, we would alert the site owner so he and his lawyers could take appropriate action.
This was a very clear example; real-life cases will generally be less clear, which is why we would have to look at them in context, and ask the site owner for guidance if we weren't sure. The case-by-case nature of this type of comment may well explain your confusion.
I'll say it once more, since it bears repeating: users who report posts where we decide no moderation needs to be done, are welcome to submit contact messages asking us why.
