How do you deal with people who will inevitably use contact as a way to affirm or deny theism (not any particular religion but 'god' in general)? Especially coming from the scientific community where any claim must be testable. Even an 'idk' would need to be followed with why you can't know.
How do you curve cult like behavior when we've seen people kill themselves over passing comets believing there were aliens of divine origin behind it? NASA would need to learn how to address philosophical questions even if the answer is 'that's not or department'.
Hell many (probably not a majority) scientists self-reported as being on some sort of spectrum between agnostic and theist. They would surely be interesting in exploring how contact may or may not reconcile the gap between the realm of science and their spirituality.
Theism is not scientific because it is not testable. Doesn't mean theism is true or false. Contact with alien intelligence could possibly change that.