He said that his "constant" in one of this theories to account for an ever existing universe was the biggest blunder of his career. I think that this self confessed blunder was due to his ideology about an eternally existing universe - a rather philosophical idea.
You're right, Einstein had a bias, but the process of science pointed it out and he came to realize that he had made a mistake. The scientific method, coupled with peer review, do a very good job of straining out an individual's biases and ending up with something objective.
Also, science doesn't presuppose itself. It started as a way of thinking, and has since been shown to be a highly effective way of thnking and seeing the world. Science is used because science works.
Edited by Perdition, : No reason given.
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