Sports v. School

Today is Parent's Night in the town which I live.
But of all the kids I tutor - none have a parent who plans to attend a single parent/teacher conference.
When the kids receive a bad grade or act up in school - these same parents blame the teachers.
"It's the teacher's job to teach my son (or daughter)" is the common reply.

But wait.
All of these kids play sports - some are good and some... not so much.
But the thing that every parent does is to make sure that every kid shows up for after school practice to raise their level of play.
All of the parents make sure that each kid shows up to summer practice to prepare for the coming year.
Each parent pays for equipment, camps and anything else their son or daughter will need to compete at their highest level.
These parents buy weights to help their children exercise and grow stronger muscles.
Each parent feels free to talk to the coaches to express their willingness to work with their son or daughter at home in an effort to help their child become better prepared and develop any weaknesses.

Why isn't their approach to school the same as their approach to sports?
These parents just don't get it.