We all have our shortcomings so we need to avoid taking our negativity with us, especially on generational ships (ships that make the long voyages taking multiple generations, to other solar systems). Actually preoperational communities should be established for such a procedure. This (or these) communities should be isolated as much as possible to develop an inner core of stability. Their members (including progeny) should be of quality from the gene pool.
They must develop self dependency for education, medical, psychological and spiritual needs. These qualities will be necessary for a successful transition of the millennium that it takes to transverse the distance between solar systems to a New Earth. Because on arrival they must be hardy and healthy and of sound mind and ability, the elements needed to develop a new world for habitation and not depleted from conflict, social turmoil and radiation poisoning.