It would not have taken much effort if he’d really wanted privacy; a window seat at the back of First Class (with a bulkhead behind) would do for a position in which nobody else could see the screen of the laptop or video player. I’m thinking he may have also been liquored up and not reasoning very clearly.
Looking at child porn would make this part of your assumption true, as to being liquored up ... that is open to conjecture. LOL!