If a parent puts their son in harms way, like allowing their 14 year old song to go to an adult gay party, where he knows no one, then they are responsible for whatever harm happens to the child in question. I would say since are the victims parents they should be held to a higher standard than a stranger, so before I put Spacey in jail i would put both the parents behind bars.
Then I would ask the kid why did he want to go to a gay party full of adults he didn't know. Its not like he was forced to go, or take lol
Summarizing... Are you trying to exculpate Spacey or blaming the victim child for what Spacey did? If you are not, I agree with you.