Some parents think its ok to take a holiday in term time because its cheaper; but if ALL parents did that then the consequences are obvious - there would be nobody there to teach. Why should one or two families save a few bob by holidaying in term time? What about the rest who pay full whack and abide by the rules?
The solution is possibly to offer schools a chance to set their own holidays, which has already been proposed, but that creates its own logistical difficulties.
Its a difficult subject but try to see it from a head teacher's point of view. They are under immense pressure to produce "results" because politicians live for headline data (too stupid to see otherwise?), therefore the ethics and morals go out of the window in order to attain the statistical outcomes, which in turn masks the real issues.
Yes, there is a problem with some families who take their kids out of school for months at a time for various reasons (how can you justify a three month trip to a foreign county to catch up with the relatives? What about your kids' education?), but you have to see it from the teachers' point of view. They can't bloody win, to be honest.
And no, I'm not a teacher, but in reference to the original post, its not worthy of a dignified reply.