If left wingers were against murderous groups they would be against centralized government, which they are not. Centralized government (that which Democrats and the murderer Obama wish for) was responsible for the murder of 100 million unarmed civilians last century and the enslavement of even more than 100 million sad persons.
If left wingers were against murder they would lock themselves for the murder of 50 million innocent unborn and a century of blood-curdling war mongering.
It is the left the loves murder. They are all criminals.