God has a purpose for everything He does and though He certainly is not obligated to explain Himself to any of us, He does typically reveal His motives through Scripture.
The libertarian mystery (if there is one) would not involve an explicit or implicit contradiction. It would merely be an admission that there is a limit to how much man can know about the nature of a free choice.
The “Lesser of Two Evils” voting strategy, falsely charged with promoting evil itself, suffers not so much for its defeatism as for its inexcusable branding.
I applaud you, my friends. Yours is a great and mighty generation. You will go farther, faster and do more in this world than I could imagine in two lifetimes.
In a less obvious way, determinism could be said to lack livability. How does one live as though all of his actions and thoughts are determined?