Royal Blue Fort's situation was more complex than Leonel knew.
In truth, there were many things that Leonel hadn't thoroughly thought through until he had a conversation with Aina.
For one, what purpose was he truly trying to accomplish?
Acting against Royal Blue Fort, even if it was just to kill a Junior Governor Duke, was no less than an act of war. At this point, Leonel would be truly setting himself as the lifelong enemy of The Empire no matter how one looked at it.
Beyond this, after killing the Junior Governor Duke, how would things proceed from there? Who would take leadership of the people who would be left behind? Would The Empire treat them all as rebels if they chose to follow Leonel? Did Leonel even want to lead them?