You don't get to redefine words to meet your fantasies.
The essence of terrorism is terror--the objective is to scare people into doing what you want.
Collateral damage has no such objective.
The invasion of Iraq was "shock and awe".
It was terrorism if there ever was terrorism.
A deliberate attack where no attack was necessary on such a scale that the attacker knew many innocents would be killed and millions would be terrorized.
You don't get to define words so they are stripped of all meaning.
If deliberately attacking for no good reason with such force that you know many innocents will die isn't terrorism then nothing is.
You could in a sense say that shock and awe is terrorism applied to military forces but the essence of terrorism is that it's applied to civilians to effect political change. Scaring the enemy army into giving up is simply good military practice.