There were two main points Huxley was addressing. One was the dangers of an all-powerful state. The government of Brave New World retains control by making its citizens so happy and superficially fulfilled that they don't care about their personal freedom. In Brave New World the consequences of state control are a loss of dignity, morals, values, and emotions—in short, a loss of humanity.
The other point is the "incompatibility of happiness and truth." This simply means that the characters in the state do everything possible to avoid facing truth which might cause them unhappiness. They have soma to push away any personal unhappiness, the relationship and family have been abolished so any of that pain is obliterated, rather than fix things they simply discard them, etc. Huxley's point is that you cannot face the truth in life and stay perfectly happy as they want to be. Their utopia is fueled by lies.
