Nobody is upholding the institution of slavery. Slavery is illegal nowadays. The southern people have a right to remember their dead ancestors, whether you find it offensive or not.
Absolutely and it's kind of funny how the ones that use "remembering" as the biggest reason are the ones that argue for erasing the historical documents on the reasoning for the war and the reasoning those monuments were built in the first place.
The ones that tend to fight for them would rather fight for the KKK and dixiecrats who built them for political gain rather than Robert E Lee and Sherman Douglas who wanted that put behind and to honor the troops but not the iconography of the Confederacy.
And I think we are fine remembering those who didn't fight for revolution against Britian but stayed with the British without putting up statues of King George and Benedict Arnold. I think we are fine honoring US Army Major Nidal Hassan as an Army Vet without building statues to him on government property.