So you'll be able to point to the part of the speech Trump called for direct action then?
Yes, easily:
"Now it is up to Congress to confront this egregious assault on our democracy. After this, we’re going to walk down and I’ll be there with you. We’re going to walk down. We’re going to walk down any one you want, but I think right here. We’re going walk down to the Capitol, and we’re going to cheer on our brave senators, and congressmen and women. 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."
That is direct action. Houseman is getting closer to the point:
He told them to go the capital, and peacefully protest, not "threaten people".
Technically mostly true. The "mostly" because surrounding a building with thousands of protestors can rarely if ever be described as unthreatening.
Unfortunately for Trump, anyone in his position should know what happens when an aggrieved crowd is riled up and directed at a target, because the human race has a long experience of thousands of years of it. He wound them up like toy soldiers, set them in motion, and then fucked off in his luxury car to the luxury comfort of the White House. Even if we were to excuse him for intent, we cannot excuse him for
negligence.
What we also have to take into account is his subsequent response. As the consequences unfolded that afternoon, he put out an equivocal Twitter video and seems to have done nothing more: for instance we know that he took little or no part in the decision to restore order with the national guard (despite his lies the day after). It's that response that really sinks him. He could not have made it plainer he did not think it serious.