They can't. Or won't. Want to see some of those posters fall into thunderous silence? Just get up a quick repartee about the life and career of Secretary Benjamin for about 20 or 30 posts.
Crickets.
Well why not try it and let's see? What was there to say about him? He was Jewish, something that seems important to you. He was born in St. Croix, raised in the Carolinas, lived in Louisiana, owned slaves and a suger plantation, may have been gay, and filled three cabinet posts in the Davis administration without any particular distinction. Oh, and in 1853 he challenged the senator from Mississippi, one Jefferson Davis, to a duel. One wonders what might have happened to history had Davis taken him up on it.