"I have right to get angry!"
Do we really have that right to get angry? Or even worse, to hate people who does wrong to us? I don't think so.
We always love to find reasons for our acts. We tend to justify things that we like, even though deep in our hearts we know that all those things are not right.
Prophet Muhammad (p.b.u.h) MAY have the right to get angry with the kafir musyrikin or the idolators, but he did not. So this really shows that anger & hatred should not ever be in our dictionary of life. Especially muslims that claimed themselves as daie (preacher).