I have been attacked by the left and the right and almost without exception, the left is ten times nastier. They don't hesitate to lie, make personal attacks, or completely destroy a person. They do whatever is necessary to achieve the goal; the end justifies the means.  I suspect it is partly due to the right having at least a vestige of a Christian conscience. For the anti-religious left, it is about ideology and too often that becomes their religion. As H. L. Mencken said,

The urge to save humanity is almost always only a false-face for the urge to rule it. Power is what all messiahs really seek: not the chance to serve.