How did the bankers' agents explain foreclosing on mortgages and driving farmers off their land?

Chapter 5 describes the coming of the bank representatives to evict the farmers. Some of the representatives are kind because they knew how cruel their job is, yet some are angry because they hate to be cruel, while yet others are merely cold and hardened by their job. These men are mostly pawns of a larger system and have no choice but to obey. For its part, the tenant system has become untenable for the banks, since one man on a tractor can efficiently take the place of a dozen families. The farmers raise the possibility of armed insurrection, but what would they fight against? They will be murderers if they stay, fighting against the wrong targets -- the messengers of the banks, not the banks themselves.