AC/DC - Night Prowler Lyrics Meaning

This song, a classic, by the way, is simply about sneaking into your girlfriend's window at night to sleep with her because her parents disapprove of your relationship.
Serial killer, Richard Ramirez, loveddd AC/DC and even said that he was inspired by some of AC/DC's songs in his killings. I think Ramirez took it the wrong way because the lyrics certainly do sound like sneaking into someone's home and murdering them brutally.