Not completely true. FDR legitimately fought for the working class and the capital class tried to organize a coup or have FDR killed: (https://en.m.wikipedia.org/wiki/Business_Plot)

I would argue the biggest issue with liberal democracy under capitalism is that it has no solution to the growing wealth disparity. As the capitalists take full ownership over the economy, they have more and more power over the government. And now we have hit a tipping point where it may very well become a full dictatorship of the wealthy