Despite the title, I did not start this topic to start an argument perse. Rather, I want to try and understand why and how people feel regarding this subject, so please, discuss with that in mind and let this not become a “who’s better” thread.
There are a lot of different things influencing the speed of a Formula One car, today maybe even more then ever before, but generally a combination of factors can give a pretty good indication, and from that, an indication can be gotten of how well the driver performed.
One thing that stand out though, is that whenever it concerns either Fernando Alonso, Lewis Hamilton, or Sebastian Vettel, for many people the argument has gotten extremely black-and-white: if Alonso/Hamilton wins, people applaud them for their legendary drives. If Vettel runs of to a victory, he has done well but it is actually all down to the Red Bull being the fastest car.
No matter the circumstances, when Vettel wins, it’s always the car.
Thus, it has become a self-fulfilling prophecy. The believe is that Vettel is not as good a driver, thus when he wins it must be the car. The believe is that Alonso/Hamilton are the best drivers, thus when they win, it is their talent.

So my question is, why? How?
Why do you always believe that Vettel only delivers results if he has the fastest car? Even if his team-mate is not showing similar pace?
How come you believe that a victory from Alonso/Hamilton is by default down to talent, even when Massa is closer than usual and/or Button is also up there?
Why is it by default unfathomable that Vettel might just be that good that in an equal or slightly faster car, he can pull 20 seconds from the field, but do you believe it possible for Alonso/Hamilton to do it on talent?
Again, I am not looking for another debate on ‘who’s better’, I am merely trying to understand this self-fulfilling prophecy that many people seem to believe in.