Rights cannot plausibly be conceived of and held irrespective of the practical consequences of applying them. It’s absurd to suppose that there could be a genuine right or duty that had disastrous consequences for human beings. Rights and duties tend to evolve just because of their apparent usefulness to humans. Similarly, it’s absurd to suppose a valid form of consequentialism that in practice flouts rights and duties. In fact, libertarianism can be interpreted as a form of rule consequentialism: it provides the rule (respect liberty) that promotes the best consequences. Far from being incompatible, deontologism and consequentialism are more like two sides of the same coin.

J. C. Lester "The Three Great Errors of Most Libertarians: A Concise Philosophical Analysis"