I do not have as much access to American media as you. Can you link me to speech where he tells crowd to riot.
trump is an experienced criminal. Like a mob boss, he rarely directly orders people to commit crimes. That would leave him liable. Instead he just makes inflammatory comments and strongly implies he wants them to commit crimes. As an example I remember of the top of my head, when the documents case was closing in on him, trump reportedly told his lawyers over and over how great hilary clinton's lawyers were because they took the wrap for her (which isn't true). then he would say it over and over trying to prod them into agreeing to tell the FBI that it was their (the lawyers) fault that documents had not been returned. If he had ordered them to do it, that would be a crime, but suggesting it would be a good thing for them to do it, is totally fine (legally speaking).
In regards to january 6th, Trump made repeated claims that the election was rigged (these were all proven to be lies in court).
“We’re probably not going to be cheering so much for some of them because you’ll never take back our country with weakness. You have to show strength, and you have to be strong.”
“The ‘Justice’ Department and the FBI have done nothing about the 2020 Presidential Election Voter Fraud, the biggest SCAM in our nation’s history, despite overwhelming evidence. They should be ashamed. History will remember. Never give up. See everyone in D.C. on January 6th.”
- this was a lie. There was no evidence of voter fraud. All attempts to find evidence failed and all court cases were thrown out for lack of evidence.
“If the liberal Democrats take the Senate and the White House — and they’re not taking this White House — we’re going to fight like hell, I’ll tell you right now,”
Trump's attorney said “Let’s have trial by combat,”
Basically, he lied to his followers telling them the election was stolen and that there was tons of evidence. There wasn't. He told them that mike pence had the power to overturn the results of the election (this too was a lie, he doesn't have that power). He told them to show up and march on the capitol where mike pence was in the process of confirming the election results. He told them they needed to fight, he told them they couldn't be weak or the country would be stolen. And when the violence started he said nothing, for hours. He only tweeted to be peaceful well after his supporters had stormed the capitol and attacked police. Reports are that he was watching it on TV and he was happy about it.
So like a mob boss, he made it clear to the crowd that he wanted them to force mike pence to try to overturn the results of the election without directly ordering them to do so. Then he reportedly laughed about it while watching it on TV and refusing to tell them to stop.