What has manned spaceflight achieved in the last 30 years?
Just in terms of encouraging political cooperation between Russia and the USA with the ISS, it has been priceless.
Other than that, we are learning about human spaceflight, if you think that is not worth the bother in and of itself, then ultimately you are choosing from a dark selection of futures.
edit -
There's plenty of inspiration available by accomplishing things in space without risking astronauts' lives to do so.
If you don't risk astronauts' lives by sending them into space, then you don't actually have any astronauts at all.
Just in terms of encouraging political cooperation between Russia and the USA with the ISS, it has been priceless.
Other than that, we are learning about human spaceflight, if you think that is not worth the bother in and of itself, then ultimately you are choosing from a dark selection of futures.
edit -
There's plenty of inspiration available by accomplishing things in space without risking astronauts' lives to do so.
If you don't risk astronauts' lives by sending them into space, then you don't actually have any astronauts at all.