The United States makes this particularly easy because it lets a young man such as Omar Mateen buy a pistol and an assault rifle with few questions asked, and the politicians who defend these insane gun-owning rights are always willing to paint the threat of Isis in the most fearful tones.
The latest incident ranks as the deadliest mass shooting in the United States so far and it is being called the nation's worst terror attack since 9/11, but it differs only in the number of dead from countless other mass shootings that have not claimed an Islamist connection. Statistically Americans are still far more likely to be killed by one of their own, taking advantage of his constitutional rights, than by agents of foreign terror. But President Barack Obama is tired of telling them so.
Typically and tastelessly, Donald Trump was quick to take advantage of the incident yesterday, tweeting that he "appreciated the congrats on radical Islamic terrorism" and disingenuously adding, "I don't want congrats, I want toughness and vigilance. We must be smart." His immigration ban on Muslims would not have made any difference in this instance - Mateen was born in the US to Islamic immigrants who have been law-abiding Americans for at least 30 years.
They and fellow Muslims do not deserve the politics of Mr Trump. But if his purpose is to alienate and further radicalise a younger Muslim generation, he is probably succeeding. Coupled with the gun laws that just about all Republicans endorse - and too few Democrats dare to oppose - the US is doing itself no favours.
President Obama reminded his nation yesterday that the victims of this killing were gay. If any Americans were terrorised yesterday it was those whose sexual orientation could be such a target. That is the worst of it.