..hmmm, I think 'instincts' are quite a strange thing really because people often say things like..'I'm a good judge of character/my instincts are usually right..' type thing but I personally don't think that anyone or most people are better or worse than anyone else tbh...if say, you meet someone for the first time and there could be some slight thing about them that for some reason makes you feel you're not sure about them or you take an instant dislike' to them..that thing that you didn't like about them and made you feel like that, could not be anything to do with them as people as such, but just something about them that has 'sparked an association' with something else in your memory that hasn't been a good memory...and it could be really simple, something just really subtle that you would never realise because it's more in your sub-conscious....
...anyway, I think that what I'm trying to say is that if people do take an 'instant dislike' etc or just see something that they don't like in someone/a personality trait etc...I think that their focus will then be on only the negative things in the person and we all have negatives and irritating things etc, so they will always think that their instincts were right and if it's the opposite in that they like someone, then they can overlook a lot of negatives and only see the positive/nice bits because they're predisposed to do that ..so then that obviously reinforces the feeling that they have good instincts....
..anyway, I think I've lost my thought process..
...but I think that we all just have instincts and we just go with them if it's appropriate and sometimes we're right and sometimes we're wrong...oh, just one last thing that I should have said lol....I also think when people do have a fixed opinion on someone and then they say 'oh, that person has changed..'..I don't believe that on the whole, people do 'change' that much but what has changed is their perspective of that person, for whatever reason, they are seeing them in a more balanced way and with a different and probably more balanced perspective...