To torture an evil person for information to save your child's life is evil to you and you feel that the paladin should give up his titles?
I think there's one thing we can all agree on: The philosophical debate between the absolute morality of certain actions vs. ends justifying the means is not going to be resolved on a gaming messageboard.
With that being said, I will also make this observation: Absolute, objective alignments and detect alignment spells don't make this sort of question easier. Quite the opposite, in fact.
"Use every man after his desert, and who should scape whipping? Use them after your own honour and dignity. The less they deserve, the more merit is in your bounty."
... but apparently I can't resist factual inaccuracy.
Information gained by torture in my opinion has to be evaluated in the same way that any information gained by any means has to be evaluated. Now the question is, why is it considered unreliable? Because the person can lie to get out of torture? Lying takes place outside of torture also, that is no reason not to use torture.
This is inaccurate. According to every study ever done on the matter, people under torture are MORE likely to lie. And torture precludes the use of interrogation techniques which have proven to be more effective and reliable.
What you're saying here is functionally equivalent to saying, "The question is, why is driving 150 mph on icy roads considered unsafe? Because your car can be in accident? Accidents can happen when your car is parked on the side of the road. That is no reason not to drive 150 mph on icy roads."
...in the same way that the most effective way to prevent crime is by punishing those who commit the crime.
This is also a highly questionable assertion. For example, locking your car door will do more to reduce your risk of having your car stolen than increasing the legal penalty for stealing a car.
Rulers would do well to study Machiavelli and his book The Prince.
You mean the book that was written as a satire specifically to mock people who believe the things you're professing here?
You might want to pay a little more attention next time you crack the cover on that one.