And if good habits are not instilled, they will have a difficult life ahead of them. It's far easier to learn those habits when young, than to try to independently course correct as an adult.
Not coercing a child towards correct behaviours, is doing them a great disservice. In some circumstances, it's child abuse to not coerce those bahaviours.
There's a huge difference between a loving parent gently but firmly teaching their kid to clean their teeth every day even though they don't want to, and a brutal schoolteacher beating facts into a class full of miserable kids.
There is in fact little difference between "you have to learn these things" and "brushing your teeth".
Thus to be ethical in your society, usually means you must follow the rules determined by a collective group of your nations ancestors or you will be shunned/jailed/harmed/etc. Which is essentially coercion. "Act this way or be punished."
White collar crime might be illegal but most societies would definitely punish a murderer either legally or illegaly. Social stigma is a MUCH more serious thing than legality of action.