I'm uncomfortable with moral revisionism.  It requires a sort of time machine reality that does not exist.  Thus, rationally, it is science fiction, not reality.  That being said, I completely understand the impetus behind the movement, and acknowledge that its reasons are absolutely sound, and reasonable.
So, here we sit, with a real issue, and an imperfect solution.  History matters, even, if not most especially, the history of wrong-doing.  It is also important to acknowledge that change is good, current modes of thinking are not absolute.  Lastly, it is important to be open to the "gray" areas.  Many of those who want the statues removed fight ceaselessly against binary thinking, and ask for more open minds when examining complex social issues.  It is not unfair to demand the same from them.
In my opinion the statues need to remain.  But, the current blind reverence they invoke needs to be altered to acknowledge the real failures of both the persons, and their times.