Ideology - Voluntary or Not?

One thing that I've been trained to do when reading a work of literature is to examine how it questions the common ideology. According to Marxist theory, ideology is transmitted through culture and the arts as well as challenged. Furthermore, Louis Althusser asserts that ideology is not voluntary but the result of structural factors in society. We don't coose to accpet or reject ideology; rather, it is so ingrained in society that we accept these ideas and beliefs as true. I guess I would thus pose the question, Do you agree with Althusser or do you think that ideology is something we consciously choose to accept? With regard to Frankenstein, there are many ways that the novel questions ideology, but in what ways does it transmit and enforce ideology?