Why not go ahead and go a step further like Germany did to rectify the sins of their past? Why not make it a capital offense to draw a swastika in class and send that kid to jail? Cut it off where it grows before it can balloon out of control.
Maybe you do not know. Swastika is the holiest symbol of Hindus, Buddhists and Jains, and has been used since time immemorial. How can you suddenly criminalise its drawing, particularly when it is drawn daily? You may not know, but it is the most printed symbol in the world.
How many people in the world would you jail for revering it? A billion plus?
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