Now, if Mar's atmosphere could be plausibly terraformed, yes, I would definitely be in favor of it.
But terraforming is impossible! Like, from the Industrial revolution and all of the CO2 we've dumped into the atmosphere, that's just a fraction of what would be needed to terraform Mars.
Even beyond the volume of gases required it's impossible because mars core long ago lost it's dynamo effect such that it doesn't produce a magnetic field like Earth's core. Therefore no protection from solar wind = bye bye any atmosphere we try to produce.
