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Think of sin/ignorance as leprosy. The ignorant man ostracized the leper, whereas Jesus healed him, showered compassion upon him. This is because the ignorant man saw sin (or leprosy) as an evil thing to be punished, whereas Jesus saw it as a sickness that needed healing.
Apply this to the present world - our thinking is dominated by the reward-punishment theory. That's why we swing between extremes - we either idolize (sometimes even worship) the people we believe are heroes. Look at the fans of celebrities. Or, sadly, we treat people as villains, bad guys, and demonize them. Look at the prison system. Not much balance. Even the popularity of certain movies/books (the almighty hero vs the arch-villain) reflect our general mindset.
If, on the other hand, we cultivate the Christian attitude (as exemplified by Jesus' healing), then we see people as victims of a sickness, call it ignorance or sin or what you will. We will no longer see them as perpetrators of evil. This major change in attitude results in a major change in behavior too. Instead of a condemnatory attitude, we will have compassion. Instead of raising the fist in retaliation, we may extend a helping hand. Instead of saying, "He is an evil man and I must punish him," we might say, "He is a victim, let me heal him."
We will no longer worship certain people as heroes, but neither will we punish those we believe are evil.
We will be healers, not butchers. And that's the beginning of wisdom.