I don't know....did he know they were swingers?
Well, since he did not testify at trial, we don't know for sure, but Brenda testified she was "amused" at Westerfield's mention of "adult parties" (she later denied dancing with him, before taking people back to their garage - locked from the inside - where drugs and sex led to enough inattention that her daughter was kidnapped of course). You tell me if that lifestyle is the best environment for children.