Yes, the group responsible for maiming hundreds of police officers across the nation, nearly beating several random citizens to death for simply going about their day-to-day business, killing a number of people in unprovoked street shootings, inciting dozens of violent, organized, riots in major cities all across the country resulting in millions, if not billions, of dollars in property damage, and literally attempting to take over portions of American cities is in order to establish militant Leftist communes,
is a "threat."
Buckwheat, Cleetus, and their "spicy memes" really are not.
The most you can really say is that the Right's a bit more likely to produce "lone wolf" shooters. However, even then, they do not have a monopoly. The Dayton shooter killed nine people, and wounded 27 more. He was a "Bernie bro," explicitly associated with ANTIFA.
2019 Dayton shooting