They have faith in the false science of the creationist propagandists and have no interest in true science.
And It's certainly not beneficial to chase intelligent Bible-believing young Christians away from science by demanding orthodoxy -- just so long as they can articulate the arguments for Old Earth.
I would say that the YEC'ers are the ones chasing young Christians away from science by demanding orthodoxy.
They include people with strong science backgrounds who are attempting to use the scientific method to back up what they believe.