The various “investigations” of the Secret Service’s failure to protect Trump are focused on operational and communication failures. The fact that the Secret Service did hardly anything normal procedures required has not yet raised the question whether elements of the Secret Service were involved. The failure is too large to be dismissed without investigation as nothing but a result of a collection of mistakes. The investigation that is needed is one that investigates whether elements in the Secret Service were involved in an assassination attempt on Trump, who is considered to be an existential threat to the ruling establishment.
The investigation cannot be conducted by the Secret Service, Homeland Security, and the FBI, because if the assassination attempt was a deep state plot, all else against Trump having failed, these three agencies are the likely ones involved in the plot