I will try to give you an analogy about why I believe banking is largely predatory (especially investment banking). It is imperfect, as all analogies are.
Now, most offices have plants, they need to be bought and looked after. There is some research that plants improve morale and productivity in businesses.
Now imagine a few clever people set themselves up as ‘business plant consultants’. They produced some (somewhat biased) research that not only having plants was important but the type of plant could be critical to the success of the business.
Now, the previously relatively minor role of plant buyer (aka finance director) became incredibly important. Plant consultants charged 10s of millions of pounds for plant advice and, on the back of that, were paid bonuses of millions of pounds, on the back of which they became huge tax payers.
It wasn’t enough to just have the right plants, as these could change, so plant consultants sold plant buyers claims on plants that might become important later. Some businesses made more from bets on plants than boring things like car sales (Porsche at one point in finance for instance) but others, making the wrong bets, lost their shareholders nearly everything (GE in the US).
Regardless of how companies actually did, more and more plant consultants were needed and this job became very desirable to our best minds. Potential genetics researchers decided to join plant consultants as the pay was so much better.
Finance is not as important as bankers would have you believe and bubbles are not harmless.