I'm absolutely with Stewart on the matter. Space travel is pure luxury. There is NOTHING to be gained from space travel other than perhaps tourism and scientific exploration. Forget everything you have heard about mining resources for Earth. It's bullshit. It doesn't pay off. It costs more than it gains.
And to waste money on space travel while people here are still suffering is crazy.
Where's the other thread where someone brought up that the US spent 40 years of NASA budget on ONE year's worth of military budget?
Stop having wars, then we can think about space travel. But first use that money for education, food, water, etc... for every spaceship that goes to Mars you could probably built desalination plants all over the world to handle fresh water shortages, for example. And when those problems are solved, THEN we can build our spaceships.