Ideology (n.) is a flawed concept because it assumes some more real, material, infrastructural dimension on which ideology is parasitic.
Ideology (n.) is a flawed concept because it assumes some real 'truth' against which ideology is supposed to be opposed.
Ideology (n.) is a flawed concept because it assumes that that some individual or collective uses it to hide the 'truth' which then needs to be exposed in its falseness by the analyst.
Ideology (n.) is a wrongheaded concept behind which lies a kind of nostalgia for a quasi-transparent form of knowledge, free from all error and illusion.
Ideology (n.) does not diminish as rigour increases and error is dissipated: a discourse can correct every mistake without undoing its ties to ideology.