Keynesian economics believes all money is government money, all wealth is government wealth, so every dollar you have is not your dollar, but government dollars they allow you to keep.
Keynesian economics claims government spending has a “multiplier effect”, meaning if the government spends a dollar it is better than you spending a dollar, that government knows best how to spend the dollar. The multiplier is 1.6 times, meaning, if you spend a dollar it is only one dollar spent but if government spends a dollar it generates another 60 cents in spending.
This is one of those cases where what is good for the economy as a whole is bad for the individual.
Both history and my personal experience demonstrate that we do not have much to worry about. Very, very few people have the will to save anything at all. And, even fewer have ever considered the difference between short-term and long-term savings.