Point 1 - One person's opinion of a particular statue being "people who did good and important things" is not necessarily another person's opinion of the same statue, they may say "people who did awful and terrible things."

Point 2 - "Do for one, do for all. Or do not do at all." Ask the ACLU, they will tell anyone that.

Point 3 - If we remove one due to some person's negative opinion, then we must remove them all. So remove them. All of them. 

PS I do not live in Germany.  I live in the United States of America and I do not decry Robert E. Lee or our history. The violent ones took that irreplaceable statue away from all of us. It is as much mine as theirs and yours, it is all of ours. But the Hate group apparently does not think so.