The original names were selected as an effort to facilitate reunification after the Civil War, not to support slavery. I know the Left doesn't like the fact that we reunified, and still wants to punish people today for sins of the nation from 160 year ago. They probably also hate that President Grant asked for half confederate veterans, half Union veterans to carry his casket as well. God forbid we come together in this nation. Separation is fuel for their political engine, after all.
But, now, names like Ft. Benning, Ft. Bragg, etc. have secondary meaning. You say Ft. Bragg to a soldier, and he thinks 82nd Airborne, special operations, etc. You say Ft. Benning, and he thinks of the infantry school (and more recently, armor), airborne training, rangers, and the like. Ft. Hood is the 1st Cavalry. Hardly anyone was aware of the sources of the 150 year old names until the Democrat culture warriors were looking for some virtue signals they could send. They like to use the military that way when they get control of the presidency. And even then, to portray those names as standing for anything other than an attempt to rebuild a unified Republic is misleading.