Love and hatred are essentially opposites to one another. When someone loves a person his heart is attracted to that person, he shall seek to look out for that person's best interests, and he shall want to remain in their company, he shall embrace that individual as an integral part of their life. When someone hates a person, it acts as a source of revulsion towards that individual, they shall seek to dissociate themselves from such an individual concluding that severing ties with them is in their best interests as any nexus with that person is toxic, destructive and unhealthy.
Of course, there are reasons for both types of reaction. Opinions about a person are based on either:
i) one's own direct experience / interaction with that person; and / or
ii) what they have learnt about that person from others, that can be based on what they have witnessed themselves or what have told them about that person.
When one loves a person it can act as a source of unconditional devotion, that first entitlement goes to the being who is perfect in his attributes and characteristics. When an individual finds the perfect being that is flawless in every way then it is natural, they develop unconditional love for him. After Allah (swt) there is no other being which is worthy of this title except Prophet Muhammad (s) - The Mercy for Mankind, which is why we read in Surah At-Tawbah verse 24:
قُلْ إِن كَانَ ءَابَآؤُكُمْ وَأَبْنَآؤُكُمْ وَإِخْوَٰنُكُمْ وَأَزْوَٰجُكُمْ وَعَشِيرَتُكُمْ وَأَمْوَٰلٌ ٱقْتَرَفْتُمُوهَا وَتِجَٰرَةٌ تَخْشَوْنَ كَسَادَهَا وَمَسَٰكِنُ تَرْضَوْنَهَآ أَحَبَّ إِلَيْكُم مِّنَ ٱللَّهِ وَرَسُولِهِۦ وَجِهَادٍ فِى سَبِيلِهِۦ فَتَرَبَّصُوا۟ حَتَّىٰ يَأْتِىَ ٱللَّهُ بِأَمْرِهِۦ ۗ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلْفَٰسِقِينَ
Say, [O Muhammad], "If your fathers, your sons, your brothers, your wives, your relatives, wealth which you have obtained, commerce wherein you fear decline, and dwellings withwhich you are pleased are more beloved to you than Allah and His Messenger and jihad in His cause, then wait until Allah executes His command. And Allah doesQnot guide the defiantly disobedient people."
Such love and devotion cannot be deemed extremeas extremism is a form of deviancy and transgression, devotion to an individual is different to worshipping that person. This is of course where Christians fell into deviation, their devotion to Prophet Isa (as) turned into their worshipping him as a God.
Hatred and aversion to something is an open sign that the soul runs away from it and seeks refuge from it. One’s natural inclination is to steer away from oppressors that partake in tyranny and oppression against others. The hatred of such people is instilled in the human conscience; we have an innate dislike for oppressors.