You look at the context, he’s saying a person in the act of a violent insurrection should expect lethal force in response.

He’s not inciting violence, he’s stating why the violence occurred.

He could also be simply saying treason carries the potential for the death penalty.

Either way not inciting violence.

He isn’t saying go use force against all the insurrectionists, unlike some politicians who were actively saying use force to overthrow the election.