When a person is steely in his contentions, certain that his viewpoint is the best path for all, void of moments of doubt and uncertainty, it may be wise to tread carefully.
When I see dogmatic behaviour, I see unfulfilled need.
To be unyielding in one's beliefs reflects some degree of indifference for the suffering of our fellow humans.
Where there is doubt, I often find decency. Where there is lack of doubt, I am careful not to get too close.