Even if you gave someone without savings 600 bucks right now, chances are they'd turn around and buy a new iphone with it instead of saving it. And then you have all the people who are in a situation where they can't save if they wanted to, be it because of poor decisions or bad circumstances out of their control.
And honestly, even if you CAN save...I'm very lucky and quite privileged, and was looking at my 401k recently. It's doing quite well (yay!), but if I extrapolate to retirement, I'm not even close to what I'll need to have a comfy retirement. The majority of people are just flat out screwed.
How to solve this...who knows. Its a hard problem.