They should not say the parents are "stupid". They should say the parents are wrong.<quoted text>
While I don't disagree totally and I am in no way saying we shouldn't teach evolution nor am I saying don't teach creation.
When you have kids grade school to jr high who have been raised with parents who believe the creation story. Than a teacher tells them "no you your parents and anyone else who believes in creation is stupid we evolved" the kid is going to break one side or the other and it can drive a rift between parent and child or child to teacher. Rifts of mistrust can kill a relationship.
What do you send your children to school for in the first place? For an education of course. Now if a parent is illiterate and cannot speak proper English does that mean you don't teach the child how to write and speak properly? Or do you simply say "We wouldn't want to drive a rift between Johnny and his parents so we are keeping him out of English class"?
It is a teacher's JOB to correct students. Part of the reason we participate in this debate is that we can show that Evolution happened. Evolution is the right answer.