yes i can confirm that this is absolutely 100% what INTJs do.i remember that time when i was in my third year of job training, we were working on sewing or something or another and then our instructor got a phone call. a girl who'd been part of our class for the last two years had died of cancer. she'd always been a bit sickly all that time, but we never knew the details, she'd meant to do the third year as well, but missed weeks and weeks right from the beginning because she wasn't well. and the moment the instructor said that outloud, it was like everyone in the room just completely stopped functionioning. when for me it was like... yes, okay, it's quite sad that someone i went to school with for two years is dead, but making myself miserable about it won't change anything, it won't make her any less dead. there's no real reason i should
not quietly acknowledge the facts and then carry on with whatever i was doing. which is precisely what i did, and predictably, everyone whined about how inconsiderate that was (towards whom? it wasn't like her parents were in the room with us or anything, and it wasn't as if
she was going to be offended by my behaviour, because she was
dead), and i outright said that if i wasn't going to be allowed to keep working, i was going to leave. and i did. if i'd wanted to do nothing at all, i could just as well have done that at home.
also, let's be real: she wasn't a friend. we got along well enough, i helped her study maths a few times, i was happy for her when she passed her exams despite much difficulty, but we never interacted outside the context of school. it simply wasn't the same thing as if someone close to me had died. because it didn't and doesn't actually, in the long run, affect my life much. honestly, even if she'd lived to complete her third year, i likely never would've seen her again anyway! you just need to be pragmatic sometimes.
it probably does come across as callous. i'm not going to pretend that i feel something i don't though, i value honesty and being true to yourself and what kind of person you are and what you value much higher than being pleasant and agreeable and easy to get along with. (hi there, i am a person who values fi over fe even while valueing thinking in general higher than either one)