I don't think it was quite as black and white as you suggest. This is how I aw it and posted earlier
"In fact, the first goal was well worked by Newcastle - simple and direct. With most of our players drawn to our right hand side Hall, in acres of space was able to switch play to our left where, ironically. for once, Mitchell was in a defensive position but far too far away to do anything to stop their player receiving the ball and passing the ball past him to Murphy. It seemed to me Murphy had been Mitchell's man to mark but he left him so as to try and close down the player Hall passed to, leaving Canvot suddenly having to come across to mark Murphy. Unfortunately, Murphy received and crossed the ball in virtually one movement before Canvot could get the block in. I don't blame Canvot for that. It was an excellent bit of work by Murphy and luckily for them his cross proved to be inch-perfect for Osula.
Sometimes you just have to say the oppo played well in that moment. Murphy's cross was inch-perfect, though I doubt he meant it like that - rather more a case of "just get the cross in early and see what happens". They were lucky and we weren't. The second goal was awful defending on our part especially by Wharton.
A game of opinions and those were mine re the two goals.