Here I will spell it out for you real simple like:
Bristol Palin achieved fame and fortune because her mother is Sarah Palin. NOT because she is one of thousands upon thousands of women to have a child outside of marriage.
No kidding.
And since very few sixteen year old girls have famous mothers, and many of them are not good at projecting realistic consequences, that is why you do not portray a situation positively that can not possibly end as well for them.
The message is not the message. The medium is the message.