I have a friend who was courted to become part of the Dark Side and be paid to work part-time in a supporting role for secondary science. He is a fantastic and passionate teacher who cares greatly about standards and good instruction. You'd be hard pressed to find a better role model for other science teachers. But he is also smart enough to realize that he can do more for kids by being in the classroom. That until district administration is willing to have guts enough to insist that science teachers teach to the standards in a high-quality way, there's no point in him talking to anyone. People will do as they please (which is what happens now) until someone holds them to their obligations.
When I read Teaching on the Titanic over at Elbows, Knees, and Dreams, I was reminded of the situation here. Over the last few years, I've seen plenty of good teachers who opened their doors and minds to greater collaboration and collegiality only to discover that it was not as rewarding professionally as just doing the best they can within their own classrooms. The level that they are willing to give to others was not returned in kind. They thought they were reaching out to support more students by working more closely with peers...only to discover that differing levels of commitment doomed it all. They opened their doors. Now they're closing them. As a teacher, you only have so much energy. You can only "save" so many kids. You make the classroom your lifeboat and hang the rest because it's too frustrating to have uninvolved peers and uncaring administration. If you have to make a choice between kids you can make a difference with and peers that you can't, it's easy to see why they've picked students.