To ask why JSA is virtually half State Pension per week

[Oilnwater]

I'm probably clueless and totally missing something which is why I'm on here asking for help in understanding ......
Currently a single person aged over 25 would get £73.10 per week JSA. A single person basic pension is £129.20.
Why the huge disparity? Who comes up
With the figures? Is there a formula?
It just strikes me as odd that both single people would in theory be facing the same housing / petrol / fuel (the winter fuel allowance isn't much) food, normal everyday costs. Why the huge difference?

Not all pensioners have "worked hard and paid into the system " all their lives.
Benefits cover pension contributions.
Anyone can live to pensionable age, it doesn't actually mean anything about lifetime contributions.

I'm under 50. By the time I reach the retirement age of the future (let's say that will soon be 75), I will have paid national insurance for 55 years. Just so I can have a pittance to live on for a few years before I die! Some people are saying I'm not even going to get that now. How can that be fair? Why are we all still paying it?

When I was a child my aunt, who would now be 113, was predicting that there would soon be no pensions. Yet, here we are 50 odd years later, and I’m collecting mine. As long as there are working age people paying NI contributions there will be a state pension.