I totally disagree that any SJ will change their opinions for any reason. I think there are some SJ's who will still believe in heaven when the sky falls on them and kills their first-born child. I know SJ's who have been to-hell-and-back because of their beliefs and never changed a thing. (And this is with 80 million people telling them to change it for themselves and their kids). Some SJ's are SO resistant it is unbelievable.
I know other SJ's who won't believe the news at all, or the court system, if it suits them. One, for instance, thinks cheating is wrong, but Bill Clinton is the most wonderful man walking. So, if I ask them, "well, what about Monica Lewinsky?", they will claim that it never happened, that Bill Clinton was framed.
So you SJ's telling me that if I gather the right information and arguments to present, you will readily change your beliefs, imo, is ridiculous. I have not found one SJ who would listen to reason, agree with it, and then change their lives and beliefs because of it. (And they continue totally living according to belief when there is TONS of information out there telling them that what they are doing is wrong.) This doesn't mean I don't like SJ's; I just accept them for who they are.
I know alot of SJ's, and some like to think they are open-minded to new ideas, but even with the best of them, you can give 'em some convincing arguments with excellent sources to back you up, and they will agree, but they aren't gonna budge irl. During the discussion, sure, they will be positive, but the next day, they will wake up, and do the exact same thing again according to old beliefs. They take no action on the information, even if it is sound. And this is what gets on my nerves so badly. LoL.
It has nothing to do with how well you can present an argument. People are who they are. Even I as a P: once I have agreed that some sort of information is solid, it will be semi-difficult to convince me of otherwise. But if it's true, I will probably see it myself anyway. I have few social or traditional concerns.
Basically, if you don't like SJ's because they are resistant, just give up and accept them as they are. Know what you know, but don't try to get them to believe you, or change them. It's pointless and it won't work. LoL..... At some point I learned not to care, and to allow them to be themselves. They are like a rock, steadfast and strong in their ways.
Now, if there are SJ's who are "different" from the SJ's I have known, I'd be willing to SEE it. Telling me they are one way won't do the job, I have to SEE it happen. And as of yet, I have not. So yea, I'm a skeptic and not so easily convinced myself, but I'm nowhere near as resistant as any SJ I know. Someone prove me wrong.......
I am talking the actual lifestyles they live. Sure, I know an SJ who drives a bug, has spiky hair, listens to the buzzcocks, etc. But when it comes to his "real" life, he's a christian and goes to church, and lives a very traditional lifestyle (4 kids, a wife who doesn't work, plays golf, watches sports), and his beliefs are in-line with social concerns (goes along with what everyone else is doing). I am talking the things that matter here and there's where you can see a real distinction between types, and THAT is where you know what they stand for. THERE'S where they don't budge. Converting a Christian to an atheist or convincing them to have sex when they don't believe in having sex before marriage is practically impossible. But an istp can change religions 4 times in a year, and be talked into trying a new activity in 10 minutes lol....... Now I have known SJ's who will delve into the realms of subcultures and deviances, of course, but in their daily lives, they are REALLY conservative and traditional. An ISTP lives there and is one of the few scouting it out, an SJ just visits basically when it's more mainstream to do so, and that's the difference. SJ's are much more mainstream, conservative, and traditional in their values, regardless, and they won't be convinced to live otherwise. Even the liberal ones I know who do delve into religion-changes, etc., are hard-pressed to change their beliefs concerning religion-changes lolol....They have been convinced of certain values from early-on, and even though these values seem to be more progressive, they are still mostly unchangeable.
I think it's mostly about values, tried-and-true (traditional) methods that have always worked, lifestyle changes, religions (whether it be worshipping cows, Metallica, or Christ, it's still THEIR tradition and not easily changed), etc. The ones I know watch everyone else change these things while they remain the same, and when it comes time when everyone else is doing it and apparently it is the right thing to do, they change it, but not until then. Non-risky and like-a-rock. That's the way it was meant to be. They aren't meant to be ahead-of-the-curve, but behind it. I pretty much see them as holding-down-the-fort while the rest of us explore the frontiers. Somebody has to do it!
End result is: An SJ or anyone else can SAY they do anything, but irl, their actions don't back up what they are saying they do. When an ISTP does make changes to their lifestyles based on information, that is when you know who they are. It takes a lot more pressure from outside sources for an SJ to make a change in action. Processing and learning information is not what it's all about, but action. Anyone can learn anything, it's what they do based on that information and how they use that information, that counts. Just my two cents.