The best salesman of our department asked for a little raise. He was fired. I’m disgusted and looking for another job

We are a good departments, we make constant profits (that it's quite uncommon in our business). He was by far the best of us, insanely good at his job, he sold so so much. He asked for a 10% raise (that it's still so low compared to how much he sold), was fired at the end of the day. I actually like my job, salary is not high but hours are not too long, but now I feel like I am just a number, if he can't ask for more, no one can (I'm very good at work but he is literally the best of all in a 400 people department). I'm also surprised that except very few co-workers, all the other ones don't seem to care about what happened.