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The infinitive implies conscious purpose, which is misleading here in _two_ respects. The secondary error is the use of the term "ideology"; ideologies are generated by practice, not as a deliberate prospect. What is wanted for the explicit purpose of _fooling_ the masses is better labeled _propaganda_. The more fundamental error is in the actual purpose of ideologies, which when served may also (probably will) often deceive the masses but more often deceives _everyone_, rulers and masses alike. And a third error lurks in the "all": It is only in capitalism that the masses need to be deliberately "fooleed"; under other systems the club and the whip 'teaches' the masses from birth what is their proper place in the structure of things.
The moral & political theory of Plato & Aristotle is more sophisticated than the moral/political theory of Mencius, because they had to deal with the fact that the Athenian 'masses' (primarily the peasants) had indeed stood up and asserted themselves; Mencius never dreamed of _that_ possibility. The positions of (e.g.) the French peasantry did not require that (ruling class) intellectuals develop a theory to "fool" them; their subordination was simply a given, but the ruling classes or castes always need (more or less unconsciously) a moral philosophy which makes them comfortable in their position. And then consider the ruling class of the Mayan Civilization: apparently they eventually killed themselves off because _their_ (justifying?) ideology called for extravagant sacrifices of their _own_ blood. They apparently bled themselves into extinction. _They_ could hardly have had "fooling" the peasantry as their conscious purpose.
Carrol