You just don't seem to get it. Here I will write it as simply as possible.
2005 - Alonso beats Kimi to the WDC. Kimi was already considered one of the best in F1 at that time and many were only waiting when he will win his first WDC. Alonso also smashed Fisi his team mate by 75 points.
2006 - Alonso beats Michael to the WDC. Michael is easily one of the best drivers ever in F1. Alonso again smashes Fisi by 62 points.
2007 - Kimi beats Alonso & Hamilton & Massa. Kimi beats a two times champion and also beats Hamilton who many considered a world champion in waiting. Kimi also beat Massa by 16 points.
2008 - Hamilton beats Massa & Kimi to the WDC. Hamilton beats a world champion and Massa to the tittle.
2009 - Button beats Rubens & Vettel to the WDC. Rubens is considered by many to be an average number 2 driver which he was his whole career. Vettel is considered by many to be very good but he had a bad season with driver mistakes and car unreability. Button beat Rubens by 18 points.
See where this is going? All the current WDC's had a much harder time racing against much better drivers than Rubens or Vettel. Alonso beat Kimi and Michael, Kimi beat Alonso, Hamilton, Massa and Hamilton beat Massa & Kimi to the tittle.
There's a big difference between Rubens, Vettel and the rest of drivers I have mentioned. What I am trying to say Button had an easy competition compared to what Alonso, Kimi and Hamilton had when they won their WDC's.
There's a big difference beating an average number 2 driver like Rubens or beating a 7 time world champion don't you think?
2005 - Alonso beats Kimi to the WDC. Kimi was already considered one of the best in F1 at that time and many were only waiting when he will win his first WDC. Alonso also smashed Fisi his team mate by 75 points.
2006 - Alonso beats Michael to the WDC. Michael is easily one of the best drivers ever in F1. Alonso again smashes Fisi by 62 points.
2007 - Kimi beats Alonso & Hamilton & Massa. Kimi beats a two times champion and also beats Hamilton who many considered a world champion in waiting. Kimi also beat Massa by 16 points.
2008 - Hamilton beats Massa & Kimi to the WDC. Hamilton beats a world champion and Massa to the tittle.
2009 - Button beats Rubens & Vettel to the WDC. Rubens is considered by many to be an average number 2 driver which he was his whole career. Vettel is considered by many to be very good but he had a bad season with driver mistakes and car unreability. Button beat Rubens by 18 points.
See where this is going? All the current WDC's had a much harder time racing against much better drivers than Rubens or Vettel. Alonso beat Kimi and Michael, Kimi beat Alonso, Hamilton, Massa and Hamilton beat Massa & Kimi to the tittle.
There's a big difference between Rubens, Vettel and the rest of drivers I have mentioned. What I am trying to say Button had an easy competition compared to what Alonso, Kimi and Hamilton had when they won their WDC's.
There's a big difference beating an average number 2 driver like Rubens or beating a 7 time world champion don't you think?
I agree with what Slyder said and would also like to point out one other thing that follows from your post:
By your argument, Alonso, Kimi and Hamilton are good drivers based on them beating their opponents. I don't know if you realize it, but all three of them actually raced against Button in 2009... So Button beat those WDC drivers in 2009. And you have classified them as good. So by your own argumentation, Button would be a worthy champion.
What you kind of forgot is also the fact the car plays. That is the same every year, the car the driver has at his disposal plays a huge part. Maybe that's why you "forgot" to mention that in 2009 Button was also racing against Kimi, Alonso and Hamilton.
