Wicked?

I hope you realize by now, I have no answers.  I write with my struggles to cause thought not condemnation. 

A few things intersected with me today.  A verse, Psalms 12:8, singed me somewhat as I thought about a question I had been asked.  The question went something like this; How can I feel something is unfit for my children to watch or take part in and then participate and feel justified just because I am older?  Certainly there may be reasons and situations that may warrant such behavior but......when I turn eighteen , do only good thoughts exist?  As an adult, do I suddenly establish a virtuous filter, eliminating all corruption?  Am I warping my perspective with things that will tear at my character?  It seems that we "old" people have much trouble making good decisions...abuse, affairs, divorce, murder.....Does "oldness" bring us justification.....rationalization?  Here is Psalms 12:8,

     The wicked freely strut about when what is vile is honored among men.

Sometimes I feel too carefree in this freedom Christ sacrificed for.  His honor should not be trivialized because I twist His word to find permission to do what I know in my heart to be less then what he desires.