It's all about theft of the public good for private gain.
Among the lies exposed is that "life expectancy" myth:
Another popular argument for cutting Social Security by raising the retirement age assumes a vast difference in human longevity between 1935 and today. You’ll hear this group of hustlers claiming that life expectancy for Americans was less than 62 years in 1935, and now it’s more than 77 years, so the program must be inadequate. Alan Simpson of the infamous Simpson-Bowles Commission, who ought to know better since he has been weighing in on Social Security policy, is a fan of this line of argument. Clearly, Simpson has not bothered to read the actual public record on Social Security, or he is knowingly lying.
Here’s the truth of the matter: The early figure was based on life expectancy at birth. That is a vastly different matter from projecting how long people will liveafter they reach the age of 65 and start collecting benefits. In the 1930s, there was much higher infant mortality, and children died much more frequently from diseases that are now preventable through immunization. Because our parents’ and grandparents’ generations had a high rate of early death, the life expectancy at birth in 1930 was indeed less than 62 years. But here’s the catch: Social Security is funded by the workers who collect the benefits, along with their employers. Obviously, if you die as a child, you are not going to collect benefits. So the significant measure is not how long you’re going to live after you are born, but rather how long you’re going to live once you hit 65.
In reality, the average life expectancy once a person has reached the age 65 has increased only a modest five years on average since 1940.
So let’s be clear. Workers who reach the age of 65 today are only living five years longer than their parents. The designers of the program were fully aware of this possibility when they calculated the retirement age and they constructed the program accordingly.