All they have to do is read the Koran and believe it.
Once they start following Mad Mo’s example, the rest of us are in peril.
"Terrorism," the way the authorities use the word always involves some ideology, and that ideology is almost always shared with somebody else in the world.
Somebody who commits acts of violence because they don't like their utility bills or because they love Jody Foster or because they hear voices isn't a "terrorist" in the way the word is usually used.
The distinction isn't between terrorists who have been influenced in some way by something outside themselves and killers who came up with some idea entirely on their own. It's between people who've been trained and are an official member of an organization, and those who act on their own without any direction or training.
We don't yet know which category Mateen fits into, but a lot of the commentary is just confusing things.