Since idiotic left-wing approach to terrorism has gone viral, lets elaborate:
Who caused the bloodbath?
a) a LONER who woke up in the morning and took a gun?
b) organised by a GROUP that was TRAINED & MOTIVATED to do so?
a = possible mental
b = terrorism (e.g. Bataclan)

(1) mass shooter kills 40
(2) trained army kills 40

Only (2) and not (1) can be a declaration of war.
(1) mentally ill loner does an assault.
(2) group of mentals are FINANCED / TRAINED to assault. It’s NOT the same, although both cases share underlying elements.