Re: Good.
Why waste time explaining the obvious to an Anonymous Corward?
Because just smugly ignoring people, or telling them they're stupid doesn't persuade them. Or anybody else for that matter. Also, this is a public discussion, so other people are reading it. Anyway, what's the purpose of any of us posting on here?
But some good arguments for space.
Weather satellites. Probably millions of lives have been saved by weather forecasting at this point. As well as loads and loads of money. In terms of disaster relief, avoiding disasters, evacuating people, steering ships and aircraft round storms. Also farmers use weather forecasting, we'd have a lot less food without spaceflight, and it would be a lot more expensive.
Climate satellites. We've learned an awful lot about the climate from satellite data. if we fail to understand the rock we live on, we're likely to fuck it up even more than we already do.
Quite a lot of geology is done by satellite. If you like stuff, that stuff is made of stuff, and at some basic point in the process the stuff to make the stuff has to get dug out of the ground. Satellites help us find that.
Military Intelligence. Stop laughing at the back there! It's not always a contradiction in terms. Satellite early warning of potential ICBM launches kept the Cold War a bit safer. Actually both sides having reasonable intelligence information about each other, did the same. Spying is often a force for peace - because you can feel reasnably sure bad things aren't about to happen to you. Plus we get to see evidence of China committing crimes against humanity in Xinjiang with the help of satellite data. Useful stuff sometimes.
Exploration. It seems to be a human instinct.
Planetary defence. You may not believe in space, but does it know that? Ten years ago an metoerite exploded above Chelyabinsk with massive force. Fortunately it exploded rather high up, due to it's angle or approach vector, and so only smashed thousands of windows and injured a bunch of people. A bit lower and there'd have been a lot of deaths. 100 years before that a similar incident occurred in Tunguska, flattening all the trees for about 30km. If that had exploded above a city, it would have killed hundreds of thousands plus. Obviously it's 65m years since the one that wiped out the dinosaurs. Big rocks are out there, and one will hit the Earth again soon. We now have a better handle on the bigger stuff that could cause the end of civilisation (or just kill a few million people) - and we almost have the technology to deal with it. Given warning. With a few years notice, all you'd need is a spacecraft with a few spray cans of paint, to divert an incoming rock sufficiently. No Bruce Willis or nuclear weapons required.
Communications. All that lovely comms stuff bringing us all closer.
GPS. Self-explanatory. That's another tech that's saved quite a few lives, as well as being incredibly useful.
Satellites. At the moment they're expensive and disposable. We now have a technology to refuel them, or at least grapple them in space and have the new satellite do the orbital control. Maybe it would be worth having people in space to do on-orbit repairs? Given the billions we spend on the things every year. But that's technology we're only reaching towards.
International cooperation. Some high profile events during the Cold War. But then afterwards the ISS was supposed to be a symbol of cooperation. As well as a way to keep ex-Soviet rocket scientists working on space, rather than going abroad (to say Iran) to help them build ICBMs.
Science. Lots of it. You never know if science will be useful, or just cool and interesting. It's good that we do it. We're a naturally curious species. It's worked for us so far, why change it?
That's not a bad list. And by no means comprehensive.