See what happens is that when a YEC teacher starts to read the text without the mental "filter" of the many YEC books and websites blinding him to what the Text actually says, they soon discover that what the text says is not all that different that what they used to think Evolution was wrong to say.

The YEC has for years believed that the first thing the Bible teaches that God created "light" before he created a "source" for that light.
The YEC is therefore a bit shocked at first to see that the Text actually has God creating the source for light first!

This has got to be a bit upsetting for the former YEC believer because they have for years critized science for teaching that you need a 'source" for light.
Now the former YEC believer sees that God created the source for all the light talked about in Genesis, and that this works well with what science teaches about the evolution of the universe..

Without the need to invent a "sourceless light" the former YEC believer now does not need to be constantly afraid that science is out to prove "There is no God'

Suddenly the former YEC believer can just allow "science to be free to be science!"
There is no more need to attack people that teach evolution!
There is no need to try to ban books of school children.
There is no need to turn the TV off when NASA is reporting some new type of discovery about the age of our universe....