There is a huge number of people out there using Google instead of their adress bar. People who guess a domain of a popular brand and type it into Google are a perfect target for spammers, because their internet skills are poor. They even get more trust this way, because "Google said it's right".
Google should protect people with poor internet skills from such sites. For everyone else there is an adress bar.
Maybe Google doesn't want people to find out, that there is an adress bar?