The John Brown card is actually quite astute. It represents the prevailing view of Brown in the 1950s/60S when these cards were printed. It was a saner more-studied time, before post-modern and politically-correct slants began to weave their little webs into contemporary mindset.
A. It identifies the raid as violent, which some now would find uncomfortable, wanting to maintain Brown as some sort of ultimate Christian, that the violence was a last resort. (i.e. A violent raid by a Northern band, led by John Brown, shocked the nation today...)
B. It identifies the group as fanatic, which some now would find uncomfortable, having bought the "Brown as martyr" thing (i.e."the fanatic group tried to seize a United States arsenal...")
C. It reiterates that the attack involved a mere handful of men, when some today would prefer we think of it as a widely-supported effort of the anti-slavery movement at the time (i.e. "With only a handful of men to support him...")
D. It recognizes that Brown had no realistic plan for loading the stolen guns, the most basic thing ever to plan for (i.e. "Failing to obtain the ammunition,...") *
E. It points out that the incident may have undercut attempts to solve the slavery problem by other more civil means -- which was underway (i.e. "High officials in the government had hoped to negotiate the serious slavery issue but tension between the north and south reached its highest peak today.")
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* though on this point (imho) this is just another hint that Brown actually never cared very much about distributing guns anyway. Brown didn't even plan to have sufficient wagons to transport the guns, let alone any ammo. Wasn't he rather focused on the end game of notoriety for his cause, his band be darned? That would be consistent with the pattern of his life up to that point. Brown was an extremely self-aggrandizing and cynical individual, dismissive even of his own family. The U.S. owes no debt to Brown. He literally may have ignited a war that didn't have to be.