The same could be said about a person stabbing someone to death. You could call it a incident. But if there was a clear intent it is called murder. Definition do matter. In above example you could argue a judge first has to declare someone guilty and I agree. In this particular case I "beleive" it is a statistically unrealistic scenario to not rule out bad intent. Thus fitting the definition. It is not about a matter of opinion, it is purely stating the fact of the act fitting the description of terrorism which I would argue isnt subjected to semantics of the vague aspects of the definition. Murder is still murder no matter who dun it.