But Passover doesn't occur in a vacuum. It is inseparably linked to the holiday of Shavu'ot, which occurs seven weeks later and commemorates the giving of the Torah. (In fact, it is obligatory to count, day by day, the days from Passover to Shavu'ot.) The deeper message is that freedom is meaningless without purpose and responsibility; in a religious context, freedom is meaningless without a sense of your place in the Divine plan.
I think there's a connection here with the insights of Victor Frankl, whom I cited in a previous post. In the course of his experiences as an inmate in Nazi concentration camps, Frankl became convinced of the importance of the freedom to choose one's own path and to behave honorably, even in the most terrible of circumstances. "It is this spiritual freedom - which cannot be taken away - that makes life meaningful and purposeful."