INSURGENT. One who is concerned in an insurrection. He differs from a rebel
in this, that rebel is always understood in a bad sense, or one who unjustly
opposes the constituted authorities; insurgent may be one who justly opposes
the tyranny of constituted authorities. The colonists who opposed the
tyranny of the English government were insurgents, not rebels.
I agree that the term is repeatedly misapplied in the case of terrorism, either in Iraq or elsewhere, as the essence of the activity is essentially the same, be it in London, Spain, Iraq, or Saudi Arabia- to make a distinction between that activity in Iraq and that same activity elsewhere is, IMO, mistaken.
The media hasn't changed the technique since Hitler's propaganda machine perfected it.