Negative energy is ugly and retrogressive. No matter how "perfect" the content of negative energy is (which is impossible), it can't be called poetry. For example, "Singing at Night" can't be sung even when the flowers are sung. Negative energy content such as "chanting shit" can't enter poetry at all.
After the words are arranged and combined. So it's called poetry, and it must be something positive.
Parting from sorrow is the content of writing poetry. But it expresses the feelings of the public. Everyone has it in his heart, but there is nothing in the pen, which can be called poetry.
Without negative energy poetry, there is no negative energy poet at all. Even if there is, it will be reviled by people and spurned by society.