I see nothing objectionable there, at least nothing worth making an argument of. But if we are looking at core issues, then we are looking at the cultural cycle which is driven by the amygdala.
When cultures rise they are majority K and largely homogeneous. This is necessary for them to rise in the first place, as
a homogeneous population is a high trust population, which is required in order for a culture to operate under the rule of law and philosophical principles.
But cultures eventually peak. They defeat all their enemies and expand their borders as far as they will go, people become wealthy and decadent and intellectual and the next generation is weaker than the previous. After the peak comes the decline.
A culture in decline is majority r, as is the case now. One common trait of declining cultures is multiculturalism. The old values are not enforced, which enables foreigners to take over.
Jews, having no country of their own, have to live in a host culture. And only declining cultures allow that. This is why they actively work to undermine their society. They can only exist in a declining culture which will inevitably destroy itself, at which point the jews move on to another host culture. They are not the direct cause, but they do further the speed and severity of the decline and makes it harder to turn things around (which, as far as I know, has never successfully been done - I only know of a single example where the decline never set in, due to some very specific circumstances which can not be replicated today).
They are parasites, in the literal sense, and no culture has ever benefited from hosting them. If you or anyone else has an example to the contrary, I would like to hear it.
The bolded portion above is the most important. What allows a population to have a high degree of trust which is required in order for a culture to operate under the rule of law and philosophical principles.
Here an answer provided by Bruce Charlton that I agree with. I will just post links this time so I don't get more angry messages about walls of text.
In regards to parasitism I would simply argue that you are looking at the symptom and not the cause. Once a culture loses its identity and degenerates into a free for all of every man for himself before the house burns down the highest IQ individuals in that population will rise to the top and grab the most for themselves if they are not restrained by a moral code that prevents this. There is little doubt as to which population has that highest IQ in the world.
That said in regards to what benefit Jews have provided to the west the answer is quite a lot. Tremendous scientific achievements have been accomplished by Jews. On a deeper level Monotheism itself has its roots in Judaism and this is arguably responsible for society as we know it. I explored that point further here: