So to summarize, Trump delivers a speech, he explicitly calls for a peaceful protest (visible in transcripts), and a very very small number of people break the law. That doesn't sound like incitement - it sounds to me like a few individuals made bad decisions and hold personal responsibility for their own actions and should be held accountable. But no court has found Trump guilty of incitement, and I bet none ever will - the evidence is simply not there.
As for Twitter - their power and influence is larger than most governments, and they should not be making unilateral decisions judging incitement and instituting bans of public figures. They operate the new public town square - and they need to be regulated like a public entity. or just nationalized like a utility and required to uphold the first amendment. And other leaders like Macron (https://www.axios.com/macron-social-media-bans-trump-twitter...) and Merkel (https://www.cnbc.com/2021/01/11/germanys-merkel-hits-out-at-...) are absolutely correct to be alarmed at the reckless actions and immense power of American tech giants, who are ideologically very biased.