Well Washington won. History is written by the victor. So of course not.
The reality is that trying to reduce the complexity of the civil war is doing an intellectual disservice to history. The war wasn't as simple as "these guys are good and these guys are bad." That is the Hollywood version. You know how Hollywood portrays Nazis. We know that to be a falsehood of course. There were normal people in the ranks whose motives were not as easily understood as "yes I want slaves" or "no I don't." Most probably didn't fully understand that concept. They were not as educated then.
So then the question becomes...do you believe that Lee was well educated in the motives? Do you think his primary concern was the cause? Do you believe him when he said he didn't want to fight against his home? I know the world would be easier if we just had clear good guys and bad guys. And there was no doubt lee was not on the "good" side, but was on the "bad" side. So we have to wonder why he picked the way he did.
Ultimately he was the leader of a rebellion that had a stated objective of freeing one group from another. There are similarities between Washington and Lee.