defend the theme of "knowledge is dangerous, so ignorance is bliss" in relation to this futuristic world

Huxley's civilized world is a society of ultimate knowledge. Humans have conquered almost all areas of scientific inquiry; they control life, death, aging, pleasure, and pain. This mastery of knowledge has given human beings great control over their world, and this control in turn has given great power to those who first envisioned such a society, and who continue to maintain its existence.

In this type of society, those in power totally support keeping the majority of the population ignorant. If you don't educate or allow people to better themselves; if you keep them blissfully carefree with the use of drugs (in this case soma); if you give them everything they need, including false feelings of security and happiness. What more could they want? Knowledge would make the populace want more, and that would be a dangerous; dangerous to those in control, but even more dangerous to those who oppose the system.