Suffering is the best, and possibly only, teacher in life. Without suffering, it is almost impossible to open one's eyes. Wanting people to see through the lies without suffering borders on fantasy unless you use brainwashing techniques.

Only when made to suffer negative consequences for their actions do people start to consider that their actions were not good. That doesn't mean they need to be starved, beaten, tortured, or bankrupted, but some manner of pain is the catalyst to learning. The only other way to learn is through constant repetition, and learning is best when the process combines both.