Well science is supposed to be impartial. Science should be able to be done by anyone, no matter of beliefs or ideology, because the scientific method is a clear set of rules, that should be easy to go by.
But since humans are flawed, and view the world subjectively, their experiences and perceptions filter the information they get. So people will be less hesitant to accept evidence that goes against their belief, and will go for evidence that support their beliefs.
Which is false, and it's a violation of the scientific method. Scientists should not go for evidence that supports their conclusions, but rather find the conclusion from the evicence, impartially.
But humans are incapable of that, unless they understand philosophy.