But it isn't currently a difficult task, it is a literally impossible task with current knowledge and understanding.

Once we can make a human-sustaining bubble on Earth, then maybe it would be worth trying to go for Mars. Right now claiming we can go to Mars and either return or live there is just as feasible as us going to and living at Alpha Centauri. It is pure sci-fi. Im closer to getting my legs replaced with robot legs that can outrun Usain Bolt than anybody is to colonizing another planet. Or building a secret base at the bottom of the Marianas Trench.