The way a galaxy was discovered, was thanks to the explorers of the universe. These individuals were the most respected individuals in the universal government, and without them, the discovered universe would stagnate with the amount of resources it possessed.. causing the constantly increasing numbers of factions and cultivators to have to battle for what was left.
Another reason why the explorers were so respected, was that they were the first line between a relatively small part of the discovered universe, and anything that was outside. More than once these brave individuals had had to face against beings which would treat them as hostile invaders.. A first contact that would usually be deadly for them.
Within the universal government, the news that one of them had left to never come back, was so common, that the idea that the explorers had suicidal tendencies had become a famous misconception.