I teach by consequence now.
When something bad happens I trace the exact source and point out every choice made by new player that resulted in the outcome.
They make excuses, shift the blame, but what I say are undeniable facts. Add the fact that I have the footage to directly refer to afterwards make transparency kind of a thing.
If there's one thing you need to know scrubs, learn one thing. You can't lie to a veteran. We don't need to actually look at you to know what you are and aren't doing. The game itself tells us everything.
e.g. if an engine get hurts. I KNOW it only takes 1 mallet hit to bring it back up to full functionality and max 5 seconds to get to it if your role is the main and in ready position). You can't bullshit that you were busy because I can see nothing else was hurt. Hence you were dicking around somewhere else (prolly on a gun). And as the consequence of that unfixed engines begins to snowball to our death (can't stabilise the arc nor reliably dodge, and hence more crap gets broken until we eventually die). I will put out the exact cause was that one screw up. Because it was.
Never lie to vet, don't be such brat and shift blame to your own screw up, take the blame, learn the lesson and keep going until you eventually get it right.
High level players don't destroy scrubs in seconds with excuses. They do it with facts, knowledge (different to facts within context) and experience.