Like the 18-month long bombardment of Charleston civilians. Oops! Union forces did that to Confederate civilians. My bad.
Think in todays terms if a mob began firing rockets into a U.S. Army or U.S. Navy base in any state in the Union. What would the immediate reacting be from Washington?
The Civil War began with South Carolina's pro-slavers triggering domestic rebellion. Whatever methods were necessary in order to fully crush the hot bed of sedition were required in forcing the enemy into surrendering.
Awwwww. Poor babies!
They could have simply surrendered.