Shahmaran,
I agree totally with this part of your comment
It wasnt Turkey who punished them, it was some idiot school teacher
and this corresponds with Muhammed the Teddy Bear in the Khartoum school last month. There is no shortage of idiots in every country of the world who make idiotic decisions or judgements which has the consequence of millions of other idiots around the world (this Forum's Pheonix included) coming to the idiotic conclusion that since a teacher in Turkey made this decision or a religious authority in Sudan made that judgement that all Turks and all Sudanese/Muslims are culpable.
But on the broader matter of the colours used by the children : if they want to use colours that are also used in Kurdish national symbolism, so let them. Freedom of expression etc. Were this a science class then I'd be with you 100% : the teacher should explain the nature of the light spectrum.
We have to make it clear that expressing Kurdish national identity is NOT equivalent or synonymous with either subverting the state of Turkey or supporting the PKK. There are a thousand shades of Kurdish identity and autonomy, most of which are no threat to the integrity of Turkey.