Why is the divide between the left and right Greater than ever?

In recent years we have noticed more political movements across western society on the more extreme side of either divide, people seem to be less tolerant than ever regarding people's views and opinions, what happened to a society where people respected each others ways and views.. things are rarely as clear as they may seem. We've seen a rise in LGBT dislike, we've seen trump elected the leader of the most powerful country in the world, things need to change.
Why is the divide between the left and right Greater than ever?
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