There certainly are a lot of these lone wolves. Enough to make a small town. When your lone wolves can fill a football stadium, you don't have a lone wolf problem. You have an invasion to deal with.
As many as 23,000 people have appeared on the radar of counter-terror agencies, according to new figures laying bare the scale of the potential threat.
In the wake of the Manchester suicide bombing it emerged that British authorities were grappling with 500 investigations into 3,000 individuals.
On Friday security sources confirmed to the Press Association a further 20,000 individuals were said to have been considered "subjects of interest" in the past, although the period the figures cover is unclear.
And those are just the knowns. Imagine the unknowns.
In the United States, the problem is still a fraction of that scale. But as Islamic migration increases, the problems will only get worse. Bringing more potential terrorists to a country has never made things better.
But by way of contrast, the Greater Manchester Police, which would have been expected to stop Salman Abedi, the second-generation Muslim refugee terrorist responsible for the Manchester Arena attack, has a total of 6,500 police officers.
It's not hard to spot the problem.