There's nothing worse than a teacher that can't teach.
Oh come now, really there are lots of things worse.
Degenerative brain disease, sociopaths with assault weapons
... the list is nearly endless.
...which means nothing to a person who doesn't know what it is.
Which is why I put it in quotes so that the OP could cut and paste and answer their own question
so i can look them up?
then come back here if there was anything they didn't understand.
(I teach SCUBA diving. All my students have survived, so I consider myself quite good at it)
I agree with you especially on the nutcases that shoot up schools. I'm a gun owner and people who do such terrible things make my hobby all the more difficult to enjoy (because all gun owners get lumped into the "psycho murderer" category).