As a matter of fact, it IS our right to see to our children's education (I'm leaving God out of it). As we are the ones who have been with them every step of the way through their entire school career, through homework and art projects and science projects and reading practice and so on and so on.
I pull my kids out of school for vacation trips without thinking twice about it. My DD is in grade 12 and has always been on the honour roll, in the honours math program, and her only non-A mark ever was in phys ed. My DS is in grade 6 and is near the top of his class and finds school "easy", so it is nobody else's business whatsoever if I believe it is my right to pull my children out of school. My parents are both teachers, as are my DH's, and they don't have a problem with people taking their kids out for family vacations - they just give them the assignments etc they missed when they get back, and expect them to do it and hand it in after they get back.
It doesn't sound like you have a very 'to each his own' attitude when you post comments like above - but it really SHOULD be to each their own, as every child, family, etc are different. And yup, I go during the off-season. It's more fun for the kids and for us, more relaxing, and it's nobody else's business but mine