Professor Paul Mullen

And he was suicidal.

There's no question he was suicidal.

So you have much more of the, if one wants to call it, your standard mass shooter rather than a terrorist.

But on the other hand, there were elements that made it perfectly reasonable

for people to consider him a terrorist.

And these things overlap.

Normally, it's quite easy to separate the terrorists from the other types of mass killer.

But in his case, both elements are there.

Terrorism can be one example.

So if you look at the behavior, they look the same.

Someone goes into a public place, kills as many people as they can with a gun, with a lorry.

with a knife, et cetera, and then is killed among the victims.

So it looks much the same.

The big difference is that terrorists are part of groups.

They are not the isolated and friendless of the world.

They are not the people who are full of resentment at how they're treated.

They're full of resentment at how whatever group they identify with, right-wing groups, males who are so badly treated by women in the 21st century, or they identify with Muslim groups who they believe are persecuted by the West, with some justification perhaps.

So the first thing about the terrorist is they're almost always part of a group.

They almost always plan their attack jointly with other members of the group.

They're usually provided with the weapons by other members of the group.