The root cause of the Selains' defeat was their excessive use of conspiracies.
When the Blue Spaceship was heading toward the Walf Galaxy, they were already cruising into a death trap. At that moment, out of careful consideration, the aliens should've said nothing, done nothing, and waited patiently for their prey to fall into the pit. By securing the initiative, their chance of making an error would have been zero.
However, they had to gild the lily, and revealed the existence of their spying devices.
