[tqi]

"let's use our very scarce resources helping the bottom kids... They're doing what they can with the resources they have."

I'm not convinced that resources are actually that scarce (the US has the second-highest amount spent per pupil among OECD countries). I think your teacher friends are doing the best with what they are being given by school boards, which is different. In many cities, the school board is considered a key stepping stone into bigger and better offices (city council, boards of supervisors, mayor, etc), which means it often attracts folks who are trying to leverage their positions to take stances on issues that have nothing to do with education. I think attacking gifted programs / tracking is one example of this, which are cast as perpetuating inequality, despite evidence that they help students across the board.