Kill points should be secondary objective only, after all some armies losing a unit means nothing yet to some it means everything, they shouldnt be worth the same in the end of the game, I mean a 1000 point paladin squad shouldnt be equal to a 10 man guard squad.
All games should have an objective and kill points be used to say in case of draw person with most KP wins or person with most kill points counts as having 1 bonus objective