It's because of this essentially:

"When Jews left Judaism they stayed religious but the religion they affirmed tended to be any form of leftism rather than Judaism. This is not a condemnation this is not an insult, it's is a description. Jews have been taught by Judaism to make a better world. That is the message of the prophets. And if they weren't going to do it through monotheism, which is how we're supposed to do it - ethical monotheism (teach the world god is the source of ethics and demands ethical behavior), they did it through secular ideologies. They rejected traditional religiosity so they accepted a new religiosity which was secular. Many people have described Marxism as secular Messianism.
Here is a distributing statistic: the most pro-communist press in the 1930s outside of the soviet union in the United States was the Yiddish Press. Jews took a new religion as a substitute for Judaism and that was, you name it: feminism, environmentalism, Marxism, socialism and for some, even communism. But Jews love isms. Jews are to isms what Italians are to operas. They create new movements and everyone will make this great world. And instead of using their religion that came with being Jewish. And it's a very sad development to me." - Dennis Prager 2013

The issue is that Jews do disproportionately dominate the areas of society that are often correlated with the negative aspects of society. Arguably, this is merely due to Ashkenazi Jews having one of the highest IQs of any race. Regardless of the reason though, it's not a good look for Jewish people. Take billionaires for example. Only 2% of the total US population is Jewish but 40% of the billionaires are Jewish. If this large of a discrepancy existed based on skin color then there would be huge cries of systematic oppression and racism.

You can find such a huge disproportionate influence in media, banking, tech, academia, intelligence, law, etc... regarding Jewish people in positions of power and influence that it's really easy for people to draw conclusions that Jews are responsible for society's problems. Hitler made the same connection. That connection he made still looks to be apparent today. You have Jewish people behind the New World Order, The Great Reset, Critical Race Theory, Marxism, Antifa etc... at a disproportionate level. This leads to many people seeing the Jews as being root causes of the problems in society.