[rmxt]

While one might be able to give a fair and balanced take on "non-optimal alternatives," I frankly believe that a bad idea, or at least bad historiography, doesn't deserve a very big seat at the table of discussion. You paint the argument as a contrast of two, and walk away from the conversation: that's not a very rational, nor fair, comparison.

...while we are quoting Aristotle:

"Since then some men are slaves by nature, and others are freemen, it is clear that where slavery is advantageous to any one, then it is just to make him a slave." [0]

Clearly "entertaining thoughts without accepting them" isn't enough on it's own to lead to sound, just and fair policy-making or historical narratives.

[0] http://www.gutenberg.org/files/6762/6762-h/6762-h.htm#link2H...