i shot john lennon backwards::Makes for a lot of music with subliminal messages about the devil, eh i shot john lennon backwards

i shot john lennon backwards::Makes for a lot of music with subliminal messages about the devil, eh?
But going back to that specific example, more to the point.
This could be heaven, this could be hell, and she showed me the way.
There were voices down the corridor, thought i heard them say.
Yeah, when he knows she should, how nice it was delicious, he puts it in a vat, he fixes it for his son which he gives away.
What the heck could this possibly mean?
Why would they be subtle about their subliminal backmasking if they were willing to put what they put in the forwards version so explicitly?