My math prof likened it to the axiomatic frameworks: if a person has bad facts or faulty reasoning, but your core axioms (values) are similar, you are more likely to come to a point of mutual agreement or at least understanding. If your values (axioms) are radically different, chances are your entire frameworks are different and possibly incompatible. You'll be talking past each other, discussing methods while in fact your goals and assumptions are completely different.
Philosophical answer - depends on your philosophy and how you feel about philosophical zombie - i.e. is it only outward results or internal causes that make a difference to you.
Although maybe that's only true if you find their values tolerable. Otherwise I suppose the advantage is in knowing you'll have to start strategizing if the conclusions from their values are incompatible with yours.
Either way it does seem valuable to know the other person's complete reasoning, just trying to quantify as many reasons why as possible.
It's pretty arrogant to assume there is only one way to look at things - your way.
If someone is acting malevolently, then you can rationalize basically anything with regards to hurting them or their well-being.
If someone just views the world differently, you will be annoyed by them, but probably not able to rationalize to yourself that they should not exist.
The first part is interesting, but ultimately, if their conclusions were based only on facts and reasoning, their conclusions would only be limited to the area of facts, "is" statements. They would not be able to derive ought/should statements. (If you believe in Hume's Guillotine.)
I'm generally of liberal persuasion. I did not agree with almost anything that our Canadian previous conservative prime minister did... but I respected him. I thought he was intelligent, effective, and thoughtful. I didn't like that he was effective and productive about things I disagreed with, but I'd shake his hand and I can imagine having a thoughtful conversation and learning something, even if my mind may or may not be changed.
On the other hand, in theory, I "agree" with many of the things Michael Moore for example is fighting for. But I do not respect him, and I cannot watch more than 2 minutes of his programs before wanting to yell at the TV. Certainly, I wouldn't elect him. He is a propagandist, he cherry picks data, and presents a skewed picture. Ann Coulter or Glenn Beck or Michael Moore or Al Franken (the pundit; he may or may not have been more honest as a politician, but his prior books were awful) - it's not a matter of how much I agree with them, but that I find them all fundamentally dishonest.
Which brings us to Trump - my biggest concern is not that I disagree with him (which I do). It's that I have no respect for his mental faculties, honesty, abilities, consistency, beliefs, values, thoughtfulness, or any of the characteristics some of us believe a head of state should have. Further, I think not only is he doing a disfavour for those who disagree with him, I think he's doing a disfavour for those who agree with him / voted for him.
At the end of the day, I may disagree with somebody about what's the best colour to paint the room; I may disagree with somebody on what the best way to fix a education system is, or even what its goals should be; I may disagree on budget priorities, on a country's role in the world, and so on. There's fascinating discussion, debate and learning to be had with people of opposing opinions.
But if somebody wants to buy a bridge somebody's selling them, enroll in a cult, or jump out of an airplane without a parachute thinking it'll end well for them, dunno... I don't think it's in the "difference of opinion" category :|
A relation of mine went from studying marine biology to full on fundie. Creationism, climate denial, etc. Huge Trump supporter too, of course.
Can any one explain to me how a one time scientist now doubts evolution?
Complicated plot. It's all interconnected...
How many liberal atheists do you know with 4+ kids, versus conservatives?
Just a thought.