This means that, the speaker is blaming an action or actions of children on their parents. A permissive attitude is one where the parents may let the children do too much of what they want and not enforce rules with them. The adjective "permissive" relates to the verb "permit", which means to allow. To blame, or to place blame, means to find who or what is at fault for the result---in this case, it is most likely the behavior of the children the is inferred in the sentence.