Eat all you can, and burn the rest!
Even in an army full of greedy, sadistic, bizarre individuals, the Insecticons stand out. They fight for nothing other than their own hunger. They are loyal to no one other than themselves. Though they occasionally fight alongside the other Decepticons, betrayal is an inevitable factor. The fact remains, however, that they are simply too powerful and effective to be easily disposed of, and so they remain to plague Autobot and Decepticon alike.