Hatred could turn to a razor, which will not clear away your hair. And if we could not derive anything from the love between people other than, it put everyone under protection.
Only that reason is critical, but there is a BIG reason.
In the book ‘Al-Adab al-Mufrad’ written by Imam Al-Bukhari. He shared a Hadith narrated by Abut Hurayra (may Allah bless him).
Abu Hurayra that the Prophet, may Allah bless him and grant him peace, said, “By the One in whose hand my soul is, you will not enter the Garden until you submit. You will not submit until you love one another. Extend the greeting to one another and you will love one another. Beware of hatred, for it is the razor. I do not tell you that it shaves the hair, but it shaves away the deen.”
First, if the Prophet used Allah as an oath for his word, it seconds the chance that his word is absolute truth.
Second, for someone not entering the Garden until the person submits to Allah. Likewise, that someone will not submit until loves is shared among others.
You will see it clearly why not loving others is the razor that shaves the deed. The deed that is been recorded and will be weighted on the judgement day.
It’s a critical issue if hatred is all in a person’s heart.
May Allah saves us from not loving, and distance us from hatred.
And Allah knows best.