hatred is a part of life. but anything in excess or out of limits can be harmful for the peace of mind and for the society. some guys deserve to receive hatred. you mostly hate when you don't get what you expect from others. somebody cheats you, or you get to know the hypocracy of someone. when you don't get your right then hatred steps in. sometimes people hate due to their personal likings and disliking which might not be rational, logical and immoral. simply hating unnecessarily is the most lame thing one could do to waste time.
i think it really takes a big heart to forgive and let go things which develop sheer hatred inside you. a rethink and reassess over issues of life might help to overcome these kind of extreme emotions. if you know that you were right and it wasn't your fault then you shouldn't hate someone. life is brief so better invest time on things which matters most to you. better spend time helping someone or discovering about different areas of life.
sometimes revenge is sweet so watching for the suitable time and doing your catharsis on those who did wrong may help.
to be continued...