I dunno, we went to the moon 40 years ago using slide rules, simply to beat Russia there. A lot of great things have happened because of the space program, outside of national pride. For starters, it provided a ton of jobs. Today, working on a spaceship to Mars probably beats working on Trump's wall to Mexico. Not to mention all of the technology that has been introduced because of spacecraft. Just a small sampling:
http://www.nasa.gov/50th/50th_magazine/benefits.html
So there's a lot of fringe benefits that happen, it's not
just about the destination. Part of the problem is that the space program gets a lot of criticism because there are other problems with the world. But going back to politics, like Trump referenced in the debate when he was giggling about tax avoidance, the politicians don't know how to manage or spend the money they have properly now. Plus, we can't be rulers of the world...globally, we produce enough food to feed 10 billion people, and yet millions die of starvation. But then we have dictators like the guys over in North Korea, so we can't effectively distribute aid as needed. The world is always going to have problems...we still need to make progress in other areas tho.