Or because they think they were better batsmen.
It's like when Sangakkara was said to be trolling when he bravely gave his honest opinion and said he thought Lara was the better batsman. He said that because that is what he thought.
Why can't people understand that since their records of those top 3-4 batsmen are so similar, that it comes down to personal preference.
It's not like someone's trying to argue that Stuart Broad is a better bowler than Wasim Akram.
Holding the view Lara is better than Sachin or vice versa is one of the greatest debates in cricket history.
Please don't try to pretend it's a not a very debatable point, because that is just disingenuous.
It's not a debatable point, because statistically Lara does not match Sachin in ODI's.
You could argue their careers over tests, but we are not talking about best Test batsmen here.
We are talking about their careers in overall effect. And the fact that Sachin chipped in with 150 odd wickets, which Lara never did, also seals the deal in their career.
If you say screw statistics, and you are only interested in what you prefer, I would be inclined to agree. But then I am sure you wouldn't fault me for saying Tendulkar is greatest ever, and Bradman is second?
At some point, you have to look at the bigger picture.
Sachin averaged above 40 at every single place he toured. Lara averaged 34 when he toured India in 17 matches, so you can naturally see, how Indian posters would not rate him that highly.
You might rate him, because you don't care about his Indian touring credentials, but that's how it stands. I would assume that's the same with Ponting.
Plus none of the other 5 greats that you mention, that are equivalent to Tendulkar , were striking centuries as a teenager in test Cricket against the quartet of Wasim, Donald etc.
There is a reason, almost every former cricketer, accepts him at least as the 2nd best batsmen of all time, if not the best.
You might like another player for his flair, his charisma , his attitude, but then don't talk about stats, when seeing Bradman.
If you follow stats, then Tendulkar is superior in both formats of the game combined.
If you follow your heart, that's fine, but don't assume that it's necessarily true.
And opinions of one past cricketer can be taken with a grain of salt, but every past cricketer can't be wrong.
A common quote.
You can fool some of the people all the time, most of the people, some of the times, but not all of the people all of the time.
150 former cricketers saying Sachin is at least 2nd best, are not being fooled.