The confederacy was founded to fight for slavery, because they believed people of colour to be inferior. It's the same reason we give "special treatment" to the flags of the Nazis, as their main goal and purpose was genocide.

Every country has committed various atrocities, but their flags do not necessarily represent those atrocities.

This isn't about the Confederates losing the war, and it's not about the southern states. No-one is asking for removal of all flags from the southern states. it's about what the confederacy stood and fought for. White supremacy and slavery.