We are usually taught to be kind, sincere and cheerful. We are taught to help the younger and respect the elders. So it is. This usually works well. However, not always. People sometimes take your kindness as weakness.
There are times when you have to be tough. It's time to gather all your strength and fight hard. When you need to act differently as usual. When you have to fight.
Why does the world teach us to turn into Imp if we are born so innocent?
It is very easy. There is no evil without goodness, and there is no goodness without evil. Everything in the world is interconnected. So you need to understand that it is important be able to show your strength. You should always be ready for any circumstances to be Imp at the right moment of life.