There is no doubting the power of language. Used wisely, it can inspire people to wonderful endeavours they may not have previously considered. Used unwisely or, to my mind, stupidly, you can whip up hatred and intolerance and unleash their horrors.
The gift of oratory is a wonderful one but should never be misused. History sadly is full of examples where it was and the one thing you can guarantee is the innocent suffer for it.