do you mean holding up hamilton? if so that lost him the championship
Well, no, not really. His crash at Fuji along with various off-track excursions cost him the title. That and not being fast enough.
Some examples:
Hungary in the Qualifiying, Japan with the safety car (Vettel and Webber), Nurburgring with the "crane"... and undirectly he was benefited by the "Alonso topic".
Utter tripe. The safety car incident was shown not be his fault. The video evidence shows it was Vettel overcooking the corner and ploughing right into the back of Webber. Indeed, that was Webber's original story, until he wanted to seem a important driver. The crane incident was well within the rules as well.
alonso in a ferrari would be better than kimi imo, but id rather not see him there!
having alonso means you will only be having 1 good driver, and now there are soo many good drivers, ie mclaren with 2, bmw with 2, your gonna want a team that can work with 2 to win the championship, mclaren obviously wont want him, will BMW?
Alonso gives more to a team than perform well in races. He's an excellent test driver as well. That's where Raikkonen lacks. Alonso does well when he is the number one. When things are equal, he doesn't like it, and we know what happens then.

Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008