Well he didn't urge people to be peaceful until after they failed at overthrowing the government. Also the government didn't plant agents in the crowd to start a riot. Dummy.
Even though I don't think there were planted agents in the crow in order to incite a riot back in January 6th, I personally cannot blame anyone who believes so, planting undercover agents in far left and far right groups is nothing in comparison to what the FBI and CIA has done in the past, both within the USA and in other countries around the world.
However, there is something I cannot get yet. If during Jan 6th there were undercover agents set to incite chaos, by the government; but was not Trump the biggest representative of the US goverment during and after that day? In theory he had access to the chief of both FBI and CIA, so if he wanted, he could have known whether there was some undercover operation going on. He held the presidential power for days after the capitol riot day.
Or he could not ask to have access to documents making reference to such operations? Does not the president have the highest security clearance?