It almost seems as if many of these parents want a utopian society where their kids can freely live without ever facing offensive material or tempting problems and that actually raising a child will no longer be a burden. It almost seems as if many folks want to make their kids--and others' kids--to be as completely at home in SodomGomorrahland as if it was simply one alternative amusement park among the rest.
Try reading 2 Peter 2 about Lot's reaction to the culture around him. We could use a bit of the distress & soul-torture Lot felt...or do you love excusing away our total desensitization to what mocks God and His good gifts?
If you want to get into the religious moral aspect of it.... Jesus crossed many temptations and overcame them. Is this not taught to our children anymore? It is not society's responsibility to teach the followings of Christ, it's the parents'.