The point of any website is to never have a 404 happen in the first place. In which case, I would feel guilty burying a missing child link in a site that would

The point of any website is to never have a 404 happen in the first place. In which case, I would feel guilty burying a missing child link in a site that would almost never show a 404 error. Might be good for a big site like facebook though. That being said "milk cartoning" is a little controversial, since it was introduced decades ago the results have been near zero.