> Colonizing Mars is such a dumb idea.
A back-of-the-napkin calculation puts humanity's total military expenditure at about $100 trillion (USD adjusted to 2022 $) since 1949. That's not accounting for lives lost, infrastructure destroyed, and all the other negatives that come from war. Humanity is spending unfathomable fortunes just to be able to kill each other. And you're saying colonizing Mars is a dumb idea? Humanity is wasting its potential on the stupidest shit you can imagine. Colonizing Mars is a galaxy-brained idea compared to most of what we're spending our money on.
And of course colonizing Mars is trivial compared to terraforming Mars, which you can make a stronger argument against. "If you can't terraform Earth, then you can't terraform Mars." Of course that argument misses the point that if you set terraforming Mars as a goal of humanity, then we focus our efforts on developing the technologies that would allow us to terraform Earth as well (long beforehand, I might add). Focusing humanity on a course to accomplish an immense feat of engineering always produces an immense amount of positive externalities.
You could have levied the same argument against the Apollo program, any of FDR's New Deal megaprojects, the national highway system, the Large Hadron Collider, ITER, etc. And of course people do say we shouldn't be "wasting" our money on such things. I say: how about we keep doing all those projects and more, and stop wasting the vast majority of our money on stupid shit like bombs that in the best case sit in a warehouse until they decompose into duds, and in the worst case kill some wedding attendees and set humanity back.