Most activists on the Left believe that they, not only their values, are morally superior to their adversaries. Therefore, coercing people to adhere to 'progressive' values is morally acceptable, even demanded.
There's a lot more power in calm than in vituperation.
More harm was done in the 20th century by faceless bureaucrats than tyrant dictators.
Those who don't hate evil hate those who do
Expectations can ruin your chances for happiness
Some of us worry about a resurgent Islam and its attendant complications for a decayed Western civilization; some of us worry about global warming. In twenty years' time, one of us will be proved right . . .