[Non Fiction] I'm feeling guilty for not telling anyone about my ex-school headmaster had been about to be compromised

Im 16 and I was kicked from my school prior. Im in 11th grade now (the final one in my country), and the ban happened during the previous one. There was a ridicilous story, at the start of the fourth quarter of term our director got replaced with a new one yet I still wonder why. Maybe she just felt like she's done running our place or (what I personally believe in) it was a forced action. The new one however had a questionable lore, her husband sits in our city's management and has some power for sure. And seemingly she is the typo human who has certain hunger of power. So it was the second of April, first day after holiday. All the classroom was informed like you better forget your mobile at home. And I got caught widdit mid-classes, my friend had witnessed that very thing. This new director came up and ordered to pass her my phone. I refused POLITELY but then it all rolled over into me being taken out in front of my class like a publical execution. So they pulled me in their office, where she (the director) and the headmaster (they are two different people), yelled at me and my mom for being what i've been for the whole 10 years of studying. The headmaster is just the one who handles all the school movement but actually she is just a pawn of the director. She has worked in this school before the new director came and she was community's beloved but in fact I know she loves to be involved in all the propaganda our country tends to pour on us so I never respected her in that school but the ex-director was chill ngl. So after I was roughly kicked out, I applied for a job and started educating on my own. I figured out that I was lucky on quitting that swift because for the rest of the term I was spectating how things went there and they did bad. Long story short there are new draconic rules but I did not give a single shit. I lived through the summer and then the new school term began, I didn't try to enter my school back and decided to keep grinding. I work on a post office and sometimes clients actually chat with us. Usually it's just the weather but two weeks ago an old man arrived in our place. He asked if I were old enough to work like I was sixteen I said. He told me that his grandson was bullied by the school administrators and their fam was about to do the same thing as me. I asked what school and it was that very one. As he was already about to leave he mentioned that his grandson was fond of an idea of eliminating the administrator. Not like an assasination but just get her fired. Even though I completely understand him I don't think this is the way how to punish, this most likely wouldn't teach that fuckass anything. So I ignored this thing. How a school kid could get her fired? It's like a dying ant againt the kvazar. And a week after I swipe through chats and see a news about two girls discover an alcohol drink in the fridge in their classroom. (in telegram there are so called channels and our school got an unofficial news channel where anyone could suggest their message) The next title is "wake up Name Surname is fired" that was the headmaster's name and surname. I haven't recalled the conversation with the old man at that moment. So I left a comment like "the headmaster SCATTERED upon seeing what the school turned into, lauging out loud" and thought that she was punished by the god himself. Today I recalled that. Now I think that I did wrong not saying a thing about it previously. That very day I wanted to tell my friends that were related to my school but I stayed silent on purpose like what if dreams come true, and only after that it flew out of my memory. I just feel not so generous as I fancy about myself now.