Its actually that you hear what you want to hear.
This is what Trump actually said, which kind of echos what he said he said.
https://www.washingtonpost.com/news/...=.c7af90f414fb
"Your concept and your idea about — it’s called concealed carry — and it only works where you have people very adept at using firearms, of which you have many, and it would be teachers and coaches.  If the coach had a firearm in his locker when he ran at this guy — that coach was very brave.  Saved a lot of lives, I suspect.  But if he had a firearm, he wouldn’t have had to run; he would have shot and that would have been the end of it.
And this would only be, obviously, for people that are very adept at handling a gun.  And it would be — it’s called concealed carry, where a teacher would have a concealed gun on them.  They’d go for special training.  And they would be there, and you would no longer have a gun-free zone.   A gun-free zone to a maniac — because they’re all cowards — a gun-free zone is, let’s go in and let’s attack, because bullets aren’t coming back at us.
And if you do this — and a lot of people are talking about it, and it’s certainly a point that we’ll discuss — but concealed carry for teachers and for people of talent — of that type of talent.  So let’s say you had 20 percent of your teaching force, because that’s pretty much the number — and you said it — an attack has lasted, on average, about three minutes.  It takes five to eight minutes for responders, for the police, to come in.  So the attack is over.  If you had a teacher with — who was adept at firearms, they could very well end the attack very quickly."