Comment: We know what duties a parent should do,

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In reply to comment: Its the duty of the parent to (see in situ)

We know what duties a parent should do,

but we also know that many, many parents don't.
I'm not putting my personal morality into your life at all, just stating that children are being sexualised younger and younger, to the detriment of the children.
People are free to watch what they want, I have no beef with that, but there are some things that shouldn't be "sprung" on kids, and other things that are entirely inappropriate....and the sweet faced Hannah Montana acting like a stripper for a targeted young audience is one of them.
As for your last paragraph, are you saying that 8 year old's doing the lap dancing move of "twerking"
is liberty? Yeah, Right!