Answer:
They have a distrust and suspicion against the U.S. government especially on the issue of gun control
Step-by-step explanation:
McVeigh, Nichols, and their associates were upset with the government because "they have a distrust and suspicion against the U.S. government especially on the issue of gun control."
This was revealed following their arrest in 1995 after they ensured that a truck bomb was exploded outside the Alfred P. Murrah Federal Building. The bomb blast that killed 168 people, including 19 young children was widely known as domestic terrorism.
After the arrest of the culprits: Terry Nichols, Timothy McVeigh, and another associate; Michael Fortier. It was revealed that these culprits were upset with the government because "they have a distrust and suspicion against the U.S. government especially on the issue of gun control."