The show contradicts itself big time.....
In present day, they discuss at length the importance of sending into space emotionally secure and strong individuals. Or at least those they feel will be best suited for the intense demands placed on them away from their home planet.
Yet 20+ years later, with even greater understanding and testing to determine who is mentally fit to go and who is not, they send up Mr. Psycho Planter.
He even states upon his arrival that it was known that he wasn't the best person to send to Mars due to how he "is."
So, they basically send up someone who is not only a very poor candidate, but one who could be dangerous. AND THEY KNOW ABOUT HIS EMOTIONAL ISSUES WAY AHEAD OF TIME
So, with all they've talked about regarding the importance of sending the right people, 20+ years later they intentionally send up an emotionally unstable guy that could damage the equipment, himself, or the entire colony.
It made no sense whatsoever to send him. And it contradicts the sort of people they are talking about today who are the best fit to visit the Red Planet.