At first I thought all these plagiarists either had no moral qualms about what they were doing or else didn't think they would get caught, but I'm starting to come around to your perspective that they might not see anything wrong with it in the first place.
I don't think it has much to do with that, but rather that they just don't have much choice. When you can't speak English very well if at all and know little about the topics you are posting in what do you expect them to do? The money is too good here to turn down, and it's too easy to copy and paste. Greed and laziness also comes into it, but for many others they don't have much choice if they literally can't really come up with their own acceptable posts. Many actually get away with it for quite a while as well as it's hard to spot and if we didn't have as many community members looking out for this behaviour many more would be geting away with it.
The account could belong to a farmer (or bought from one). There's been a fair few farmers (some using bots and others not) that just chose 'real' random names for their usernames here. Maybe they pulled them from somewhere or used a generator but it's not that uncommon. They also might think that using a real name gives them an advantage or makes them more 'real'. I dunno. Probably not worth spending too much time thinking about the hows and whys of this though .