It's our destiney to leave this rock. If we don't, humanity dies here. It's that simple.
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You really can't simulate non earth conditions on earth. Different gravitational forces, weather, length of days, radiation, etc. You gotta do it for real, and it's likely going to be real messy at first. People are going to die. However, if we are ever going to try to teraform another world, mars is the logical starting point.
you are like the plebs telling Columbus not to sail across the oceans.
Its in mans nature to push the boundaries.
Hmmm....wonder how far these go
http://s5.postimg.org/44tvjp49z/penta_facepalm.jpg
https://img.memecdn.com/Mega-Facepalm_fb_93738.jpg
Ok I'm done.