Its the ultimate in savage evolution. Only the strong survive in a battle of the youngsters. When they finally hit their adult level their desire to kill each other is burned out. Maybe they only kill their siblings.
So if they lay 4 eggs in a alien and 1 survives you get a whole species of equal alphas and they hit their final growth into adults where they go from instinct driven killing machines to sentient intelligent driven killing machines.
With the Klingon's they fight wars based on house dominance, with the strongest family taking the throne. The weakest families are probably little better then slaves.