This opinion piece seems to be the "view through rose colored glasses".
It is correct that people on dangerous missions tend to bond emotionally. But, they are not random samples of humanity. They are both self-selected and then culled by authoritative processes to fit the needed aptitudes and attitudes.
So, initially, I think space colonies, where the first inhabitants have been selected based on their specific personalities, will perform as this opinion expresses.
But, a real colony is self- sustaining by biological reproduction. And, that introduces the randomness of the full variability of human psychology.
While it it true that a lot of an individual's personality is molded by parental influences, there is some part of an individual's personality that seems to not be amenable to parental influences. So, some fraction of people will probably always be psychopaths, introverts, or just plain crazy illogical. Some may become suicidal.
How an isolated space colony deals with individuals who are dangerously non-conformist is the issue. Despite what this opinion piece says about guests in the desert, other societies, including non-human societies, have processes for casting out those whom the group will not tolerate. Can the offenders in a space colony be sent back to Earth? Or will they be killed?
And, if there is an authority that has the power of live and death over individuals in a colony, will that power be attained by someone who will abuse it?
And, realistically, what humans fight about on Earth is territory and resources. If there are competing colonies in space, will they end up going to war with each other?