Why do king Lions kill all their step children when they capture a new territory ?

The king lion is a weird and mean creature by every definition of a being. Its way of life is very rough to say the least, chasing every invader away sometimes killing them. The king does not like any competition or sharing its territory with strange blood from another bloodline. Therefore, when the king lion takes over a new territory with female lions, a lot of cleansing and reorganization. If any of the females had baby lions/cobs by a different male lion, the king will annihilate them one by one. The poor female lion has no say but watch all her babies murdered by the king. There are two top reasons why he eliminates the cobs, they are not his bloodline. They may grow up and turn against him in the future. Secondly, the killing of the cobs frees the female lion to engage in sexual activities to produce cobs of the king's bloodline. Well, there is a reason why they are referred to as kings. We all know what the kings of old are capable of doing to anyone who dare challenge them. Are animals smarter and more evil than we know about them? Your thoughts? Welcome to provocativedebate.com.