There is no such thing as immutable or uncorruptable OS. My late father would always find a way to fuck up the laptop I setup for him. He would even come back with errors that I've seen for the first time and our conversation would go like this:

Me: How did this happen? My Father: how should know? It was like this when I turned it on. Me: what did you do before you turned it off last time? My Father: I was on Facebook, played some backgammon and watched some YouTube. Me: ...

I miss him and I would gladly give everything to have him bother me with his laptop problems one more time. I hope that he is getting some good support where ever he is.