[Ginguin]

While this feels like a right answer, I would say that you can go deeper when doing a real root cause analysis.

The desire for money is rooted in a deeper problem. Money is just a means of exchange. What more money really gives you is access and opportunity. The more money you have, the more access you have to limited resources. We want more money because we don't have enough to own the things we want, do the things we want, control the things we want, etc.

Money is a means for control and fulfillment, both of which are not universally available due to hard limits (we don't have unlimited resources) and relative intangibles (the structure of society). A real root cause analysis would go deeper than "The love of money" to why money is something to be loved.