i spent a full 15 minutes discussing this with my girlfriend
original post is here
roy is not lawful anything. he planned a coupe well before finding a valid reason to do it.
*looks at the Ishbal war and the many, many atrocities and crimes against humanity that Roy and his friends and comrades were forced to do in the name of their country and the military they served, the very thing that made him decide he wanted to one day be on top so he could change things*
Nope. No legitimate reason at all.
Roy wanted to overthrow the government before the ishval war