PPL instruction is dangerous because they simply don't know any better. But you'll soon learn that anything below a 1000' can kill you and above it doesn't.
Instrument instruction is dangerous because you need to spend a lot of time inside the airplane trying to find where they're going wrong.
As soon as possible start filing IFR on training flights.
Multi training is the most dangerous because they will try and kill you out of ignorance and not caring to understand.
Do not do a Vmc demo unless they fully understand it on the ground. An FTD or basic sim is even better.
You'd also think that most can fly by the time they reach the Multi but some still don't understand the rules of the game.