I had, in the past, found that a post was deleted. I was so enraged by that action that I had abandoned HN for almost a year. It wasn't my post. But, I found the action arbitrary. I do understand that it is important to keep the spirit of HN and actively discourage posts that might take HN the same way as infinite other internet forums. Since the guidelines cannot be clearly interpreted, there will always be some controversy about what should or should not have been removed. This case is different though, because the post was down-voted out by the community.