See also Against Self Sacrifice . A bank manager has a duty to protect the customer's investment. But if the customer, having been offered a particular pattern of investment and informed of its merits, declines it, then if the bank manager goes ahead and spends the money on what he thinks is good for the customer, he will go to jail. Likewise, the duty to protect one's children never justifies overriding their own wishes in regard to what should happen to them, or what is done for them. Children want to be safe even when, on occasions, they need to take risks.
Coercion is harmful.
But whether it is immoral or not depends on the situation and in particular on the obligations that the parties have towards each other. For a parent to coerce his child is in general immoral because the situation in which the failure to reach agreement occurred is the result of the parent's choices and not the child's.