That is because you have KPs who have the mindset “if it ain’t concern me, I won’t say anything. Better don’t offend the big bosses (aka SLs).” If they dare to speak up, then no such things will happen. Anw, if you are able to bring up facts and support your teachers, your SLs really cannot fault them for their minor mistakes. If your teachers have really done well and can be supported with facts, then you cannot penalise them for small insignificant mistakes. Also, if you have done your job really well as a KP, you wouldn’t not speak for your teachers. Many times, KPs are afraid to speak up simply because they are afraid SLs will redirect their attention to scrutinise their work. But why do you need to be afraid if you have always been diligent? No one can really penalise you unless facts tell otherwise.