I grew up in an area with a lot of these liberals (Jewish and Christian).
There is probably an evil hard-core of about 1% who want to steal your stuff and/or kill you in pursuit of political goals.
Most of the rest of them are just brainwashed by the education system and the media. They associate their views with virtue, and believe it would be evil to change them.
They can be gently nudged towards common sense, one issue at a time—if they do not believe that one of those “evil crazy right wingers” is the person talking to them. ;-)