Whilst I wouldn't claim to have all the answers (or even some) my underlying attitude is that the population of the world is too high. Too many people causing issues we seem unable to address.
This is perfectly valid. The issue isn't about reducing the world's population which would be a good thing, its about the way our society is structured. Historically there were always more working people than pensioners. It therefore made sense that the NI contributions made by workers today, paid for the pensions and care of the pensioners today. The NI you pay isn't ring fenced for "you" it's used for your mum/dad/ grandparents etc.
However, with improvements in healthcare and changes in working practices, instead of dropping down dead the year after retirement, people are going on to live for many more years. As an illustration of polar opposites, my grandfather died at 65, the year he retired. My grandmother died at 103, some
43 years after she retired. She milked that final salary pension for all it was worth.
So as the working population reduces, there is less money to pay for the aging population which is becoming much greater than the number of people able to support it. The only way to balance that is either to reduce pensions & care payments which is very unpopular, or to increase NI and taxes to pay for it - or to increase the population by welcoming immigrants (especially if there are job roles where we have a shortage of workers).