I'm interested in your ethical position here.

Is there anything short of mass murder which you would feel morally opposed to? (And if not, why that? I mean, if you are only concerned with harmful effects, killing on a large scale has gotten us where we are now, right?)

Is potential, practical, harmful effects the right dividing line? Is it a clear line; is there any issue you are unsure about? Would raising a toast, or a statue, to Stalin in the Ukraine raise some qualms, even though the act itself would hurt no one?