You may be the ultimate authority when it comes to your kids. However, the school is the authority when it comes time to grade them or pass them. And you are not really the ultimate authority - anyone who has spent anytime working with foster care kids whose parents have had their parental rights pulled knows that the state can and will intervene in how you raise your kids. You must, in most states, feed them, clothe them, send them to school between the ages of six and sixteen (or homeschool them according to your state law), not abuse them, not allow them to drink alcohol, maintain a level of discipline that keeps them out of juvy, etc. Not doing these things will cause the state to intervene.
I have no issue with people who pull their kids and are willing to face consequences. But the school has no obligation to pass your kid or give them As because you pulled them for two weeks - even if they do A level work on their tests. Attendance is often one of the factors to grading - it isn't just about passing tests and knowing the material.
We all make choices regarding our children. Some of us miss school for vacations. Others spend a lot of time, money and energy on school, often at the cost of family time. Some put so much emphasis on sports that both family time and school have to give. Some put more emphasis on their moral and religious foundation - spending a lot of time on church or community activities - it isn't school they wouldn't dream of missing for Disney, but church. All this is fine, but you can't expect the world adapt to your choices - when you choose one thing you give up another. If you want to end up with a pro hockey player, or a kid who gets a scholarship to MIT - these sacrifices may be worthwhile.