>Politics and truth are not rational.

The replication and survival of an idea is based on its fitness within the environment.

To decide that truth is not important in the world of politics is to decide that the veracity of an idea plays no important role with respect to its fitness.

You seem quite content with that. It is a pity you would rather play the docile host of memetic competition rather than assert yourself as a critical thinker to create an environment where truthful ideas hold the advantage and may prosper.