Everything used to be under the covers, we knew certain things but didn't talk about it. Now, with the internet everything bubbles up, we can not pretend we do not know anymore. 
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Look at Toronto, the great multi-culture example for the world. Well there has always been ghettos of cultures and races. The diversity was moderate, people pretended to get along, they tolerated but they always bought houses in their own ghetto, their kids married with in their own culture and it still the same. Now we are being forced, being shamed into diversity - it's not going to end well.