No, it's not that complicated at all. People who know they are worthless look down upon others to feel better about themselves.
And no, intolerance of intolerance is not intolerance at all, it's expectation of tolerance as that is your prevailing idea.
Not being OK with intolerance is an evolutionary trait that we have, it's innate and it's the reason why we can feel others pain, it's known as empathy. I can feel how hurt other people are by their intolerance and understand that it is wrong.
This is not complicated, this is normal human behaviour and it is instinctual.
I am sorry, but you have it wrong. People who "feel worthless but have no idea that they do" look down on others to feel better about themselves.
And yes, intolerance of intolerance is intolerance and you can not expect tolerance from people who are not aware of the source of that intolerance, the fact that they hate themselves and have no idea that they do.
This is even simpler than you think but appears complicated because it solved only by the resolution of paradox at a higher level of consciousness. What you call normal is normal for a person who lives in the delusion of duality, that right and wrong are real, that what one has been conditioned to believe is the good actually is the good. What you call normal is a mass psychosis.
What is instinctual is that the good is beyond good and evil. It is all that exists. Everything always has been and always will be perfect. It is words and language and the easily made associations to feelings of pain, being put down as children, that put us in prison. It happened to you and it happened to me and to everybody else. We do not want to relive the pain of being made to feel inferior and hate of the other is the result.
Empathy is vital but it has no bounds because all who hurt others do so because they are miserable themselves. We lost our true natures and can't experience love and joy. It is the being duty of all who have awakened to save those who have not. That is real empathy. It's all in the golden rule and the lord's prayer.
Your trespasses will be forgiven as you forgive. I believe that the belief in duality and the concomitant capacity for self hate thus generated is the original sin one of which we are all guilty. Let he who is free of that sin cast the first stone.
What you called easy actually really isn't. It's the hardest thing in the world to let go of moral entitlement and forgive
It requires a state of perfect and open love, the very state we were in when we were psychically murdered. To return is to face old monsters.
You know there is a good, a God if you will. That is innate within you. Your empathy lives but perhaps it is unconsciously restricted by the unexamined assumption that it doesn't apply to you. Thank you for your support of me. I see kindness is you and yearning for the good. I would only ask you to extend it to those farther down the ladder.
There is a Buddhist prayer, or so I think I remember, that go, "I vow to save all sentient beings" I think a person's aim says things about them. Thank you thank you.