Iman Has Nothing to Do With Feeling Sad and Grief

When Zaid was killed, Aishir said, the life went from his face. We could see the Luzun in his face. This is what we call an English shock. He's just seen and heard the news that is going to bring this to him. You can feel sad, you can be a grief-struck. Our Prophet ﷺ cried multiple times, multiple times. Is anybody going to say this is a lack of iman?