There ought to be a course in high school called "gas lighting 101". My kids have taken courses in high school to identify false or misleading advertising which is useful in the real world. To take things a step further young people need to interpret what politicians or people who run massive business are really saying. That's where an instructive course in "gas lighting" comes in handy. 
She promised this, but meant that. We could have used this course with Kathleen Wynne here in Ontario. In America Donald Trump, Kelly Ann Conway, Sean Spicer, Rudy Guiliani, etc. they are deserve to go into the "gas lighting" hall of fame. Or shame.