I could be a jackass and mention that you made no distinction beyond implication as to what kind of discrimination you are against. Last I checked, being able to discern distinctive qualities of different individuals and objects is a sign of intelligence.
I won't take that route though, instead suggesting that you be more specific.
What pledge are you talking about? Are you pledging not to be racist? No sexism for you? Are you against all forms of discrimination? Is it the violence that you are against?
There are plenty of reasons to be against hating someone because they are different than you, but the whole pledge thing just seems childish and pointless. Kind of like this comment.
Ah well, at least I answered your question.