People who take fault have the growth mindset. If you haven’t read Mindset by Carol Dweck I highly recommend it. I wrote a post about it earlier this year.
The growth mindset is the belief that in any situation you can improve. People with the growth mindset value trying and learning more than status or ending position.
I’ve noticed that people with the growth mindset tend to take fault whenever they can. In disputes, they don’t get defensive to try to prove they are right, they immediately find a fault in themselves because they believe they can fix it.