Of course, individual humans might be perfectly happy where they are. I have a sister-in-law who almost never leaves her hometown and would be content to sit in her house 24/7.
oh im not suggesting we give up exploring- I only meant to point out we have a perfectly suitable planet to live on and it will take massive problem solving to live on another planet- and be too burdensome and expensive- but yeah, visiting is fine- but again, we have the perfect planet to live on now- Maybe someday outer-space living will be a financially and physically viable alternative, but again, are we trying to build another tower of babble?