Arnold was a traitor to the American cause and the cause of liberty and sold himself out to tyranny; he has no sympathy from me.
You want to do this?
Fine, we'll do this.
To paint the American War of Independence as liberty vs. tyranny is a simplification for a number of reasons. One of them is that there was no actual
tyrant on the British side - there was bitter debate in Parliament about how to handle things, and it was about a century since that Parliament had proven it could break a king and replace him.
The very nature of the Boston Tea Party is part and parcel of that - the British tea was cheaper than the stuff certain wealthy smugglers were bringing in, and they're the ones who organized that action.
Another reason is the explanation that
Arnold gave for his changing sides. He was pessimistic over the way Congress was infighting and the dissatisfaction in the army - and, of course, that he'd been repeatedly passed over for no good reason despite the claims of the new government to respect ability over connections.
And, finally... if the American cause was the cause of Liberty and Britain was Tyranny, then there is no possible explanation nor justification for things like the way slaves counted for the voting power of the states their owners lived in or how slavery remained legal.
I have no quarrel with the idea that the US cause was overall just. I do, however, object to Arnold being called a traitor undeserving of sympathy but Washington all but whitewashed.