It's not that I don't think retired people have contributed enough. How much is enough anyway? If you earn less than average your NI wouldn't come to the amount you mentioned. But lots of people earning below average do very important jobs society needs. And the global index.fund is very dependant on those people.
It's more the rhetoric that "I contributed and everyone else is scrounging". What if you fall ill at 60 having worked up till then? Do you try to take unemployment benefit (worthless, working age benefit scroungers) or should you be allowed to take the pension early with the understanding that at 82 you have had it all. Or if you live past 88 is that it, you had all your money?
And if someone at the age of 60 who falls ill through no fault of their own is still deserving, what about a 30 year old who falls ill. What's the cut of where we say this person deserves/doesn't deserve it.
A lot of people are really angry at the idea vast.sums are being wasted on benefits for children living overseas, or treating foreigners, or people who can't be bothered to work. It's a lie. While there is probably dishonesty it's a tiny proportion of the actual expenses. All of the "record welfare bill" headlines in the Mail include pension costs because they make up the bill of costs. And the bulk of NHS costs. But if you point that out people get upset because "I contributed".
A 67 year old today would have grown up in the 50s when there was more availability of council houses etc. They didn't pay for it because they were children. Generations above them paid in some cases 70-90% income tax to fund this support network they benefitted from. When they were old enough to earn money, Thatcher came in and income tax got a lot less. But as a result subsequent generations got less in terms of council housing etc and you get angry articles in the Mail about housing benefit bills and there's a sense that young people didn't earn it. Or that the system must be failing because of everyone else taking the piss. When really it's a result of privatisation. I'ts true, many younger people haven't paid enough into the system yet. But when the average retiree was young and hadn't paid into the system they benefitted from the fact that other people older than them had.
And no matter how much you contributed to a private pension or to NI, the only reason it would grow (you quoted the global index fund average return) is because of other people working. And some of those other people might even claim housing benefit/need to take sickness. Just as currently retired people worked to enable the generations above them to be retired and also benefited from the support network in place.
Smashing the system up for younger generations because "it's not fair" or to enable a sense of Daily Mail inspired grievance will.ultimately backfire on those drawing pensions.