DH has a really generous defined benefit pension plan. He is always amazed at the number of his colleagues who don't save a penny toward retirement.
The reason to save is so you have choices in your life. One of my BFF's dad was a retired Fleetwood executive. Fleetwood declared bankruptcy and his pension evaporated overnight. Fortunately, they had other savings to fall back on, but it was a rocky post-retirement road for them for quite a while. Here's another one. A couple I know were counting on her pension as one of their three legs of their retirement stool. At about age 50, she died suddenly of a brain aneurysm. He was shocked to discover that her pension payout was only a tiny fraction of what it would have been had she lived to retirement age. He had to scramble, including selling their house and moving to a less expensive part of the country in the middle of his grieving process. So sad.
You do it for yourselves, because it gives you choices. Is there any better reason than that?