He should have used the example of a terrorist using Uber to get to the site of a planned terrorist attack, although that might have stretched credibility.
Maybe an angry ex-spouse planning to do violence to an ex-spouse's person or property? I don't know. He should have been able to brainstorm something more creative than the cliche go-to boogeyman, the Nazis. Since when were the Nazis only against Jews? They were a National Socialist movement (yes Socialist, like the growing movement within the Democratic party today!) who were against many groups of people besides the Jews.
But then again, how relevant are Nazis or the KKK in 2019? They barely even exist, and certainly have no measurable power or influence anywhere in the country. They are the dumbest, most non-existent, most toothless boogeymen a large number of people still actually fear.