Is it because the parents themselves are rule breakers/entitled/hate authority?
Or is it because they can't fathom their kids have faults and so even if they're proven to be a problem the parents back the kids up instead of the school? (I've seen this myself and can't understand the logic....)
(Inspired by the locked toilet thread)
Are the grandparents actually to blame? What happened at what time to make this generation of parents so ineffectual?