gonna guess you "can't understand why" because you're a straight white male and have never once felt left out of anything or been in a position where asking "are there any people like me in this" was a question you'd even need to ask.
I am actually not white, light-skinned maybe, and south-american, not from the states. And no, being white, straight and male hasn't really gave me the privilege of a perfect life, because the world doesn't work based on race, so your assumption is actually racist itself (and even sexist and almost discriminative based on sexuality too, wich is crazy double standards), as you assume every white straight male person lacks the "moral values" to have empathy or have suffered in life. I've been bullied for having curly hair, discriminated due to my average height, insulted for having to wear glasses back when I was a kid, abused by my mother, etc.
So, let me guess, you're a soft person who's been a victim of a bad occurence in your life or victimized yourself based on a group you belong to (even if you weren't personally attacked), and now you wander life believing that certain groups, such as yours, and other minorities have a rough life while you despise other races, ethnicities, genders even(?, because of your ideology and also a lack of understanding other people views. Accurate enough?