On one hand, the actual insurrectionists themselves in their own words believe that Trump has been telling them to take back the country by any means necessary for weeks if not months, and that his words to them on 1/6 were that he, personally and literally, would walk with them and support their actions to do so, also by any means necessary.
On the other hand are claims that Trump's initial speech on 1/6, in and of itself and per se, did not meet the legal standard for inciting insurrection.
Assuming for the sake of argument that both things are true, context is all. In this context, Trump took no actions and made no announcements to quell the violence and the clear and present danger to the 435 + 1 for many hours.
Sometimes no actions and no words speak louder than actions and words. The weeks since the election have been filled with dog whistles to the dogs of (civil) war and insurrection. No cry of havoc was necessary, it was all a wink and a nod. Thankfully, impeachment is a political penalty for a political crime (newsflash to the clueless) and in this case be sufficient to help ensure a transition to the next administration.