If an INFJ remembers small details about your life, does it always mean they're interested, or could it just be their nature?

Do you avoid confrontation or struggle to initiate it? Why or why not?
How do you talk to someone on a completely different moral wavelength than you? This is not to say that it’s necessarily worse or better, just different.
Has there been anyone historically who had an extremely high IQ and made a huge impact on civilization?