According to Ishmael, why can't they escape from captivity

Captivity is the subject that Ishmael professes to teach. Having been raised in captivity, he considers it his area of expertise. He complicates the issue, however, by refusing to feel resentful of his captors. Largely, this complication reflects his larger feelings of pity for his captors; he believes that Mother Culture holds all of society captive. The planet's salvation comes in realizing that the “Taker Prison” holds most of us captive, and then working to dismantle those limitations.