You're making the same mistake that I describe above. You don't know what the attacker's motives were, and to qualify as terrorism the motive must be specific and the attack rationally planned. How rational was it for this so-called terrorist to attack the Louvre and/or its shopping area, when scores of soldiers had been guarding it for some time? Obviously he could've picked another, unguarded area in Paris to attack passersby with a machete. If he was a bona fide terrorist, that would've been the rational choice, as was the choice of last year's terrorist attack on a Paris nightclub.

It's not simply a matter of quibbling over semantics. By screaming "terrorism" every time something like this happens, politicians invoke visceral fear in the public. As we've just seen in Canada, that can contribute to tragic outcomes.