I never said MC's rage wasn't justified. I didn't say anything about MC's rage at all, I don't think. I don't really have a strong opinion on it one way or the other, tbh.
What I said is that saying everybody (in the story) is okay with what Rohan did relies on the false premise that they know what he did to begin with. MC being upset with Rohan for unexplained reasons isn't a good enough reason for the others, who don't know MC or Rohan and in some cases, each other, to be outraged on MC's behalf.
Basically, people usually don't form an opinion on something they know nothing about, and almost no one (in the story) knows about what happened between MC and Rohan.