Few men associated with the Revolutionary War accomplished more for the Continental Army than Arnold and few men who survived the war sacrificed more for the Continental Army. He was a commander during the capture of Fort Ticonderoga and was perhaps the most important commander during the Patriots' victory at Saratoga. He was wounded twice in combat and spent the rest of his life walking with a limp. He sacrificed his personal fortune to finance military expeditions and supply his troops, falling heavily into debt as a result.
Several men with fewer accomplishments but better connections got promoted over him, including St. Clair, who lost Fort Ticonderoga to the British. The Continental Congress didn't properly reimburse Arnold for his expenses. Arnold was just someone who originally thought the Patriot cause was the better cause, and he fought bravely and sacrificed dearly for it until the Continental government betrayed Arnold before he betrayed it. Oh, and to add insult to injury, part of his court martial was a politically motivated accusation of war profiteering after he had sacrificed his personal fortune and went into debt to finance the rebel war effort. I don't blame Arnold for what he did, and I would've said "eff these effing chumps" and done the same thing a lot sooner than he did had I been in his shoes. He was a lot more patient than I would've been, but it's human nature to fall for the sunken cost fallacy during a war, so maybe that's why he took it up the poop chute from those guys as long as he did.
You have to keep in mind that America back then was a lot different than it is now. Whereas all Americans celebrate 4th of July today, at the time of the war a significant percentage of Americans remained loyal to the Crown, including a majority of the people in the state of Georgia, a majority of the people in Charleston, SC and a majority of the people in NYC. The Patriots were sort of like the DPR & LPR militias that the American propaganda demonizes in eastern Ukraine, with a majority of the people in the Donbas supporting the local militias and a lower but significant percentage supporting the Ukrainian government. It was like that in America. It wasn't like Americans were practically all on the same side like during our 20th and 21st century wars with him being the odd man out. Benedict Arnold was a British citizen as all of the Americans were at the time. Every Patriot was a traitor to the Crown. Arnold was just unique that he was a traitor twice over, turning his back on both governments during the war. Arnold had experience living under both governments and, unlike the Loyalists, he decided to give the Continental government a chance and risk everything for it until it proved itself even more corrupt than the British government.
Nico's situation isn't like Arnold's at all. Tennessee never did Nico dirty the way the Continental government did Arnold. But Nico's like a lot of us who quit one company for another in hopes of more pay. He didn't get more pay, but from a moral and ethical standpoint none of us who have changed jobs for more money, myself included, are any different or any better than Nico. Most of us just make less money than he does.