Would discovery of another habitable planet for humans solve problems or create new ones?

More complex is never easier.
Alien planet order of magnitude more complex (read wars for ownership).

Having known our species for some forty odd years…; problems.

Well, hmmmm. I think it could go both ways. I would hope that if we colonized it we would have learned from the horrible mistakes we’ve made on this planet.

It wouldn’t solve problems, and it wouldn’t create new ones of any particular type. If we can screw up this planet, we can screw up any planet. Humanity is a pestilence, a cancer, a plague.

We can’t work together on this planet. When we went to the moon, there were and still are concerns about one country or another establishing a military presence there. I can’t picture a new planet being any different.

Why thee hell would any one want to establish a military presence on the moon?! I can imagine a military presence in outer space, in orbit around the earth, but on the moon?

@Dutchess_III I can think of a few very simple reasons. It gives a platform from which to launch ships and/or weapons. You could test new weapons. You could establish a “beach head” on the moon and use it for your people and no one else unless they pay dearly.

Why though?