"One thing I've never understood. Why is it always the coaches fault?"
At the end of the day, it rarely matters does it?
Coaches, just like bosses, have power.
We have choices. Stay or leave.
Sometimes leaving is best, yes. But more often than not -- in sports -- it's best to accept those things we cannot change ... and get after it!!
This is an interesting tangent. Two significant differences between HS Coach and a boss on a job that make it a false comparison IMO.
1) The options to leave a HS team are very limited. Perhaps a private or your family has to pack up and move or become creative in a transfer. Jobs have much more mobility than being a player in a HS sport.
2) HS is a child vs. an Adult with Power. Jobs are two adults that made affirmative decisions to be in the situation. They have many options beyond the current setup basically because of reason number 1.
The whole dynamic of HS Sports is very simple: It is the Coach's Team/Universe. You are at his leisure and there is no democracy. You are a totally captive audience based on the house your parents bought. You have zero choice or say in the matter. If you want to play you must do so based on his wishes, failure to comply can and frequently does carry consequences.
The only exception to this basic truth is Coach misconduct.