Sunyata is the truth and compassion is not an illusion?

It’s curious that if you study Buddhism you need to understand that Maya is an illusion and life is a product of cause and effect of past karma, so is deceptive. All my emotions are deceptive but not compassion.The void is the ultimate reality and is not part of anything bigger. Why compassion is not deceptive then , if it is itself part of an illusion and it is an emotion ? Shouldn’t be only an act of positive karma which as well will create only positive effects? But why then positive karma can push toward the void , or “ultimate goal” if the sunnyata is anything else rather than void itself. It shouldn’t have any attribute of “positive” or “negative” which are supposed to be moral and discriminatory observations.if the void needs to have moral attitudes to get access into, talking about sunnyata as ultimate reality , isn’t becoming a contradiction by its own logical terms?