Why someone is violent? It is because they are so stressed and the mind is small. It can't think big. And why is it so? Because of lack of education and lack of spirituality. This opportunity was not given to them. They were never given education where love, non-violence, happiness were all taught, correct! So their mind and heart is closed. So when you find this, you will stop disliking them. And the next step is you will have compassion, 'oh, poor thing!'
They don't have the vision to see life and see others. They make wrong judgments all the time and think bad about others and behave badly and hurt themselves. So when you understand that these are the factors that lead them to that type of behavior, you get compassion.
So, don't try to love them. Stop disliking them and then have compassion. Then the third step automatically is you can't but love everybody.

Sri Sri Ravi Shankar