Perhaps you would care to enlighten us?  Other than McVey and the Federal Building, would you be referring to the Waco incident, the Idaho incident, the incident in Oregon, or perhaps Kent State?  Oh no, those were 'government' attacks against US Citizens.  
There is no universal agreement on the definition of terrorism, however it is defined as: the systematic use of terror especially as a means of coercion.  Which brings us to, what is terror?  Defined; a state of intense fear, a cause of anxiety , an appalling person or thing, violent or destructive acts (as bombing) committed by groups in order to intimidate a population or government.

So based on this, Government actions could be terrorism.  The KKK is terroristic as well as the BLM and Occupy Wall Street.  To some, politicians imposing new taxes could be terrorism.  However in the real world of this current article, I perhaps should have said, "virtually" all terrorist attacks!  But even that would not satisfy some ideologies!