The Killik naturally did not care about life much until the Crash. The Crash was when Welk and Lomi Plo crashed on a Killik world, in a ship from Myrkr the "Tachyon Flyer" with their prisoner Raynar Thul, a Jedi who was involved in the attack on Myrkr. Raynar managed to use the force to make the Killik heal him but in the process, was made mostly insect and The Joiner King. The Killik share a collective mind which allow them to transmit thought between each other. So when Raynar became one of the Hive, The Jedi love of life was passed to all Killiks, causing them to value and try to preserve life.