Part of the idea of welcoming the south back in, and kudos to Grant for doing so, was recognizing that southerners were our countrymen again without trying to force them to forget or deny that for which they mourned. If, as the practice indicates, part of this reconciliation involved planting CSA veterans in VA cemeteries, then let the reconciliation extend to allowing the flag for which they fought to fly over their graves. The north is doing less to reconcile the situation than any time since about 1875.
The flag they fought for was a flag of treason.