Moderate racial reformers dwindled as their ideals fragmented and diverged. [causal]
The "Motion of the Sixty-one" and the defection of Chevallier signified that the "men of good will" of both races had got sadly thinner and thinner on the ground, as their liberal ideas became more and more diffuse and divergent.
Horne, Alistair, A Savage War of Peace- Alge…, loc. 393