It's because there brain pust every emotion into one place in the back of their head except for anger sadness and madness those are just a little further up than the rest.
Since I'm on the topic I might as well make a zodiac sign post alright
How I feel about the zodiac signs (coming from a Sagittarius)
Aquarius: yall are alright
Aries NO!
Leo Leo-eve me alone (they have been really clingy to me)
Libra Meh
Scorpio My bestie
Virgo you can tag along I guess
Cancer *flees the scene*
Capricorn my ride or die
Gemini too much drama in their switch life
Piceis (sorry I misspelled that) *straight up avoids*
Taurus let's go get milkshakes together
I hope no one was offended by this and remember that you dont have to act like your zodiac sign if that's not who you truly are.