Seems they have correctly identified the western worlds weakness.
Isn't it the same with climate warming? In the long run it would have been cheaper to prevent climate warning in it's early stages. Yet, we delayed (and are delaying) necessary actions as long as possible. In the end, the loss caused by climate change will by far outweigh the cost if we'd have taken measures early.
Now that said, assuming your enemy is competent can also lead to strategic miscalculation, such as Russia invading Ukraine when everybody but the US thought they would never be insane enough to do so. There's a difference between "what I would do if I were X" as opposed to "what would X really do?"
That said, it's safer to assume that the adversary is intelligent but that isn't a substitute for actually understanding your enemy. Or perhaps, they don't have to be your enemy.