The huge difference with the professions you mention is that in all of them successful participants don't wed themselves to any premise. They can allow for the possibility of two competing premises, or even usefully imagine a world with a counterfactual premise, and accurately communicate the uncertainty or incongruence of their views (it is technically possible for political science to work this way too, but rare to find someone who hasn't picked a "team" outside of academia).

The irrationality and intellectual danger lies not in adopting hypothesis but in granting them the status of dogma.

I would also argue that the potential for real world harm of adopting a wrong premise is way less for a cosmologist or mathematician than for a religious leader or politician. Relevant SMBC: http://smbc-comics.com/comic/purity-3