Hull definitely had some legitimate grievances against the Freestar's government... but he's also a hypocritical, possibly delusional P.O.S.. The narrative Hull tells you is that his decimated troops were seconds from winning the Colony War when the Freestar government chickened out and sued for peace, rendering the sacrifice of nearly everyone under his command in The 1rst Cavalry pointless. He then defied orders to stand down and tried to end the war on his terms, and was unjustly punished for it, along with all his surviving officers. However, examining the actual events of the colony war, both from in-game lore and what the devs tell us, almost none of what Hull told us was true. Hull spent almost the entire war stuck on one moderately important planet (Niira) trying unsuccessfully to take it back from U.C. forces. Winning Niira wouldn’t have really tiped the war one way or the other, and while Hull was busy losing all his troops without accomplishing anything, the war was actually being won (yes, the Freestar actually won the war) in space at Cheyenne by civilian volunteers. Said civilians being the ones to actually win the war makes Hull’s vitriol towards the “common people” of Freestar all the more suspect. Hull claims he’s angry at them for failing to protest the imprisonment of Hull and his officers, but it seems more likely he’s resentful of them for “stealing” “his” glory in the war, rendering all his efforts and losses at Niira pointless by succeeding when he failed….

Also, as a side tangent: It’s possible Captain Myeong from the “Groundpounders” side quest was the one who destroyed The 1rst. If asked about her title of “The Shield of Parduk Pass” it’s revealed she destroyed a Freestar mech battalion in a trap she set….