Well, Rid, you never know what new angle in someone's approach might prompt another reader to rethink some assumption. It can also be interesting just to learn others' struggles. But it's impressive to find with how much confidence, not to say defiance, individuals normally cautious to base their scientific and technical judgments on evidence will blurt out vehement, absolutist declarations dismissing as invalid all variant testimony. This gives theological dispute, not to say philosophy, not to say free speech, a bad name.
To those interested in trying others' viewpoints, Augustine's Confessions, Martin Buber's I and Thou, Pascal's Thoughts, Bertrand Russell's Why I am not a Christian, even Hesse's Siddhartha are pretty accessible inquiries. But they're useful only to the extent a reader is able to suspend formed opinions for the duration of the exposure. They can always be picked up again later.
Charlie Chan say: Mind like parachute, only function when open.