Throaway because of reasons and change some details because of reasons.
So, we are all volunteers in a pretty known association, me, friend A, friend B, and Person, all doing different jobs. 
Recently we have been accused of something related to Person work. 
We have all defended them, because they told us they didn't do it, but abruptly we discovered that they did not do the things we are accused of but another one, more serious.
They didn't admit it, instead they have been offended and they have been passive aggressive towards all of us, let alone excused themselves.
Talking with friends A and B, me and Awere very very angry about all the story and commented it but we didn't say anything more than Person is arrogant and they have lied.
Now, friend B is mad at me because they say that I am violent, I don't understand what a dreadful day Person is going through, and I don't want to look at the overall picture, and they don't think Person has lied, but only forgot to tell us how things gone. He told me that I'm cruel and unforgiven, while all we know that what person did is a very common practice in his job.

AITA?