Yet libertarians and the left share much, conservatism is your enemy, something that you both desire to defeat and overcome.
Don't confuse me with the libertarians. I'm an independent.
Yes, the left and libertarians agree on many things. But they also disagree on many things, and the biggest disagreement (size and power of government) will prevent them from ever working together.
The absolutists in both groups (libertarians and conservatives) undermine themselves: they are too busy fighting each other to band together and defeat the left on issues on economic and civil liberty issues.
Meanwhile, the left is able to set aside their differences and build a coalition that puts them in power to defeat conservatives on all the issues. They do it largely by demonizing conservatives over hot button issues that affect few people, but convinces them to vote against their economic self-interest.