How do the Defarges manipulate the mender of roads in the Versailles scene? (Chapter 15)

In A Tale of Two Cities, the French
are pretty clearly divided into patriots and aristocrats.  The patriots (peasants) must
stand as a united front against the aristocrats (rich) if they ever hope to win a
revolution to effect change.  The Mender of Roads is clearly not an aristocrat, and he
is clearly one of the poor peasants.

The Defarges take him
to Versailles, the glorious palace of the King and Queen.  They take him for one
purpose--to make sure he is not swayed, later on, by all the finery and trappings of
this luxurious lifestyle.  We watch his eyes glaze over when he sees it all for the
first time, and we understand that he will not be able to kill and destroy that which he
finds so beautiful and impressive.  The Defarges are quite sly with him, telling him as
he's cheering madly for the royals:

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"Bravo!...You are the fellow we want," said
Defarge in his ear; "you make these fools believe that it will last for ever.  Then,
they are the more insolent, and it is the nearer
ended."

After the Mender of
Roads pauses to reflect, he agrees.  The Defarges go on to use two analogies, dolls and
birds, to further their point.  They ask if he were given all the dolls or all the birds
he could find and wanted to take some of their clothing or plumage for himself, would he
not take the richest, brightest and finest?  When he says he would, indeed, Madame
Defarge replies:

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"You have seen both dolls and birds
to-day....now, go home!"

What
they hoped to achieve was some disillusionment for the sumptuous appearance of the
aristocracy, reminding him it was all trappings--trappings bought at the price of food
on his table and clothes on his
back.