Welcome to the weird and wonderful, confusing, sad, empty, full, blizzard of ______.
Why do people hate? why are there genocides and war? People feeling the (very fake) power of killing another human being. Why is there anti-semitism and racism (you can just let people be without finding someone to hate - you idiots. Why do people bully and enjoy shaming those they have authority over? Why do people abuse animals - sentient beings who only want to love (trust me they want love over treats).
Simply: people are really really stupid
Less simply: These are all sick people who have never known unconditional love or compassion. They only know "I" and they live to protect their "I" and survive in an environment that may be very cruel and unjust. Many aquired hate from their parents who aquired it from their parents and have never given it a second thought. Only the wise want to be an alien in the group. Many are scared of having morality conversations with themselves because it may distance themselves from the people in their lives or make them a target. Hate for many is a feeling of power. To them, they hate, so they matter. If you love, you are weak and of no use to their nonsense goals that bring our world deeper into hell (totally kidding about that, the thought of hell just makes me laugh).
When you grow up in violent environments, how do you escape it? Usually you just go along with it because the thought of fighting it is scary. It seems wrong because it goes against everything you were raised on, how could everything I've ever been taught wrong? This is a near impossible feat to overcome. It is scary to free yourself from dellusions and let go of the "I" for the all and even scarier to face the truth. The truth of who you are, who you want to be and risk feeling extreme guilt for betraying those who fed you, mentored you, gave you company when you were lonely.
Anyone who needs to hear this from someone who sees good in everyone: You can always start over, you are not trapped, this world is yours, this life is yours. Yours alone. Please don't go through it as a coward. You are strong, start asking questions, don't ignore the troubled, question everything. If you don't you will fall into traps. I know you can find truth. Yes, truth can mean many things, but if you find it you will know what I mean. When there is nothing to fear and no one can reach you way up on that mountain in your head then you are on your way to brahman.