The Secret Service and DC police are filled with people who haven’t had to actually face any kind of threat, until Trump. They have always known there is no “right wing extremism,” especially since the left has been funding that narrative for years. The only danger that any politicians have faced is from their underage sex slaves.
These federal agencies are incompetent because they actually haven’t had to deal with any political violence or threats inside the US at all. The FBI, the Secret Service, the DC police, every intelligence apparatus have all been orchestrating the “extremists” in partnership with the left, so they have no idea how to deal with it when the golems they’ve created go off script.