“ Once the definition changes from wrong to evil, there is sweet release. We have full license to hate, and we do so with reckless abandon.”
And I think that is the dirty secret of the SJW movement (and of any sort of fanaticism, but the Social Justice variety is the most prominent current example). Anger can be a pleasurable sensation — even to the point of being a drug — and like any drug it can lead to an addiction which always looks for a cause to supply the needed fix. And what is hatred but a permanent state of anger toward a fixed object?
Movements like this draw people who are looking for this very thing, where they can indulge their need for anger and express it by doing wretched things to others while feeling perfectly righteous themselves.