This isn’t really a good angle to critique finance IMO, because it is indeed a necessary part of the modern economy.

A better angle is how finance tends to acquire a ton of smart young people that could/would otherwise be doing work that has more benefits to society. It’s hard to blame the individual here, because the salaries are orders of magnitude larger in finance vs. say, aerospace engineering. Would I turn down $700k at a hedge fund to earn $90k at a science lab? Probably not, unless I was already independently wealthy.