The angry mob wanted to kill him, not the orchestrators that would have pull with the USSS. Do you think they were going to drive him out into the mob to the world's shittiest gallows?

If it ever came out that people in the Trump administration actively participated in a well-defined plot to kill Pence, they would fry. That's why they sicced the mob on the capital to commit spontaneous violence. Difficult if not impossible to prove conspiracy, and the people getting jail time would be the red hat morons, not the people in charge. Again, they (the orchestrators) were half-hearted cowards that were more concerned with saving themselves if it failed than doing anything to make sure it succeeded, and for this moment in time we should be thankful for that.