Colliric , It’s a truth what you are saying .
But we are weak human creatures , and in some life periods , its extremely difficult to overcome your struggle with the body.
I am a Christian from my childhood , and I know and remember that some young teenagers whose parents were not Christians had not survived long in the Community just because they could not bear the hardship of the struggle with the body , and they were in depressions and did not come back to the Community any more , because of the rebellion , the rebellion against God , against the Christian living , against their unlucky spiritual experience.
I think if some one would explain to them then that fornication is much worst sin… , that to leave the community and faith is much worst sin …, then may be now they would be Christian followers and not the people who are indifferent to any spiritual experiences in their life.