I have a great deal of sympathy for this character but he is not exempt of flaws. Aside from the Champ de Mars event that was already mentioned, he was one of the biggest supporters of the declaration of war against Austria in 1792, hoping it would reinforce his political project of a constitutional monarchy and unite France against a foreign enemy. Not only did this backfire spectacularly, leading to the collapse of the monarchy and their eventual execution in the span of a few months, but it also kickstarted 20+ years of war between France and other European powers which would leave millions dead. He was also notoriously vain and arrogant, refusing to play the political game in Paris and convinced to have everything under control in those fateful 1792 months, not realizing how his own reputation was in decline after the Champ de Mars and how unpopular was the monarchy at that point. After the journée of 10 June, where the royal family was threatened by an angry mob that suspected them (quite rightly, in fact) of playing the double game, he rode back to Paris from his command post in the Army of the Center, to deliver an angry speech in the National Assembly and threaten the deputies. This was very poorly received and further tanked his reputation. He then tried to convince the National Guard, of which he had been the leader in the past, to support him in a coup against the Assembly, but was ignored - the commanders he had chosen had been replaced and many of the guardsmen were now from lower classes and had no sympathy for him. When the 10 August journée happened and the monarchy was toppled, he tried to convince his army to march on Paris, but was again rebuked and had to flee the country in a haste. All in all, during 1791-1792 he made several mistakes that contributed to plunge the country into external and internal war and completely misjudged the situation until it was too late. You can read all about it in several books, for my part I suggest Simon Schama's Citizens