I think you might want to look at assertiveness rather than aggressiveness. Being calm when things go bad is an amazing trait to have. Many get carried away and being aggressive does not help. It seems to win an argument but that's about it. Hollow points. Whenever I have dealt aggressiveness with aggressiveness, I felt bad later.
Just like you speak up uncomfortable truths in normal situations, being assertive during tough situations helps. Then the assertive person becomes the voice of reason, instead of raising the voice, they are calm, empathise and talk objectively. The argument may be lost if the other person is unreasonable. But people will know whom to support. Not easy to start with but over time it becomes the default state.
Just like you speak up uncomfortable truths in normal situations, being assertive during tough situations helps. Then the assertive person becomes the voice of reason, instead of raising the voice, they are calm, empathise and talk objectively. The argument may be lost if the other person is unreasonable. But people will know whom to support. Not easy to start with but over time it becomes the default state.
We have enough aggressive people already :).