Trump Tweets
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Not sure I agree with the message of that saying. Words can hurt. It's important children learn how to deal with the hurt. Way too many people have grown up in bubbles and don't know how to cope when they enter the real world. They want to ban free speech because they were never taught how to deal with free speech.
A better question is why should they be allowed to attend in the first place, not why they should be barred.