Perhaps inferring nefarious intent is unwarranted. However if you follow PG's Twitter stream a reasonably clear pattern does emerge.
- Denounce critics of happiness industry.
- Play-down the idea of minimum support framework. In general, play down community and governmental support infrastructure in favour of individual's agency.
- The current crop of rich people, by and large, earned it and their way of earning wealth is objectively better than earlier ones. So they not only deserve that wealth but also deserve the way it's been accumulated.
- In today's world anyone can be rich and so if you aren't rich then it's your problem.
- Tech will eat the world. Journalists who couldn't foresee Amazon and its ilk's rise are idiots who don't understand exponential curve.
I have dramatised the theme but it's not far off.
I won't judge if any of these are right or not because at the end of the day they are all opinions and he's entitled to have them based on his world view. Someone with a different world view and experience (such as me, for instance) will not agree with them and that's OK.
That said, based on the pattern above it's easy to see how can one assign intent to PG's posts.
- Quoting your comment: "The real sinister psychological thing going on behind the Graham argument is that..."
- Quoting a line from the article: "His seemingly impartial and logical writing attempts to hide his true intentions."