Why are liberals so quick to censor any views or words that challenge liberalism?

They are intolerant, desperate, and dishonest. They like to preach tolerance, but they mean tolerance for their views, they react angrily to the views of others. They consider it a hate crime to depict muslims in a derogatory way, but art, if for example, a painting of the Virgin Mary decorated with elephant dung. I have no problem slamming liberals, they are a plague on America.