Session 243 - Ali Ibn Abu Talib (ra)- The father of the khwarij was not an easy find

Alee ibn Abu Talib (ra) session 243 The father of the khwarij was not an easy find  amongst the dead. 'Love for a thing makes you blind and deaf.' 'If I was not amongst you, do you think the people would behave in a correct manner' Alee (ra) (in battle against ones brothers). How to deal with and treat the khwarij, are they unbelievers?