It's funny, 7 years of higher ed, 6 of them in a Russell Group university medical school... I would not dream of teaching what I have learned without weeks of research and having it checked over. The responsibility of not teaching a false fact with so many facts to teach would leave me researching for weeks for a single lecture.
To think of how care free we once threw a talk together, quoted Watchtower 'facts' without question and simply repeated what we once heard from the one source of ALL data, the society. I remember doing several talks with only minutes of preperation, when people didn't show up. Impressive? NO improper and unprofessional! The responsibility of teaching is no joke.
I am ashamed I did it at all. We used to teach up to 150 people a week, including children, with no more preperation than a half hearted bit of reading. Mostly looking to impress people with a ridiculous illustration or analogy, essential when promoting bullshit as the story being explained in of itself is illogical or immoral or simply wrong.