I'd like to think people here are aware that using language with some precision is important.
This is not terrorism. Terrorism has a very specific meaning. It involves a group or individual with political aims, but instead of engaging in a standard war-type conflict, they use violence and fear against the civilian population to create political pressure on the government toward achiving their political goals.
This meaning, since 9/11, has been eroded, initially mainly by the American government, in order to justify their actions against people they want to label as terrorists, as the international laws of war do not apply to terrorists in the same way they do to soldiers.
Since then it seems all kinds of governments and the media have decided to use the word for it's emotional power to manipulate, rather than to actually communicate in an accurate way.
A mass shooting does not = terrorism, even if it's an attempt at some sort of eradication of certain people, or a protest, or whatever.