Quoting UanarchyK from 20:34, 4th Aug 2008
Logic is objective, it's science, mathematics, there is no opinion in it.
Apologies in advance for pedantry, but logic is not science. Logic is a method of rational thinking and reasoning, and has nothing in itself to do with objectivity or even with fact, necessarily. It is entirely theoretical and mental and in it's pure form has no concern for the physical universe.
Science is, strictly speaking, a method of investigation into the physical universe. It relies upon experiment, observation, and deduction to make general claims from specific data. Like logic, it relies upon a process of reasoning to take given data (in this case known facts) and theorize about the conclusions that can be drawn from that data. Then science demands experimentation to prove that the hypothesis thus created is true.
Despite requiring a lot of theoretical thinking and mental analysis, science is fundamentally inseperable from physical reality. Logic is not so inseperable. That's why logic is taught as a philosophy and not as a science.
The point that arises out of this is that while you are correct and there is no place for opinion in logic, there is room for opinion in science. Different scientists will interpret data differently and come up with different hypotheses to explain it. Most of the historic breakthroughs have been the result of intuition rather than pure deductive logical reasoning. What keeps science rational is the requirement that any hypothesis, no matter how arrived at, has to be subjected to potential disproof through experimentation.
In order to be disproven by the scientific method, something has to be experimentable. Things which can not be disproven by experiment fall outside of science's balliwick, such as claims of the existence of God.
There are reasons to believe things to be true that are not scientific, however. If I were to tell you that I don't like to swim, I've made a claim about physical reality and yet there is no experiment that could be devised to prove that I don't like to swim. Fundamentally, you have to take my word for it, unless you have reason to believe otherwise - for example, having seen me at the beach in the water swimming and apparently having a good time. But again, that isn't *proof* since I could have simply been play-acting, and really having a terrible time.
We have to make decisions about what we believe to be true about many many things every single day that we either don't or can't subject to scientific analysis. Persons of a religious persuasion rest their case on admittedly circumstantial evidence, but there is no cause to dismiss such claims immediately out of hand on the basis that 'science can't (dis)prove that,' unless you really are prepared to go through life agnostic about most things and holding no opinions about anything (or, of course being a hypocrite and only using the 'science' excuse for the things *you* don't personally believe about the world).
I'm not saying you have to accept religious claims, either. I'm simply pointing out that there are reasons for believing things about the universe that are outside of science's scope. These beliefs range from the mundane (LP doesn't like to swim) to the profound (God created the universe), and it is illogical to accept the *possibility* of the truth of such beliefs provided they are mundane but to deny them categorically just because they happen to be about things on a larger scale.
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Man is free; yet we must not suppose that he is at liberty to do everything he pleases, for he becomes a slave the moment he allows his actions to be ruled by passion. --Giacomo Casanova
Man is free; yet we must not suppose that he is at liberty to do everything he pleases, for he becomes a slave the moment he allows his actions to be ruled by passion. --Giacomo Casanova