To understand how a leftist could write (and other leftists could re-post) something like this -- and still claim that "the far-right (i.e., anyone who isn't a Communist) are the domestic terrorists", one has to understand how leftists define what is and is not terrorism:
1. Issuing threats of physical assault and destruction, or actually committing the same, in support of leftist causes: Not terrorism.
2. Opposing leftist causes by any means, irrespective of how non-violent that opposition is: terrorism.