Suicide is a consequence of shame. Human beings have evolved an emotional mechanism that lets them function as groups; this mechanism functions by giving each individual an unconscious sense of whether they "measure up" to the standards of the group around them. One consequence of that is that some fraction of individuals won't, oftentimes with tragic results for the individual. But groups that have this mechanism killed or absorbed all individuals that don't (well, not quite - psychopathy is the absence of shame, and it's usually maladaptive but some high-functioning psychopaths can blend in among normal society), and so the world we live in includes suicide.
Banks serve financial markets. It's okay for individual banks to fail as long as the market as a whole continues to function; in fact, proper functioning of the market requires some banks to fail.
It's the same as ant colonies or human microbiomes. When you step on an individual ant, the colony doesn't care, because the unit of survival is the colony. When you crap out intestinal bacteria, you don't shed a tear, because the unit of survival is the individual human and not the bacteria within them. In fact, the perspective with which you look at the world says a lot about the degree of interaction within the system. We think of a human as an individual entity; it took us a long time to think of a cell as an individual entity; and unless you're a dedicated biologist you probably don't think of a mitochondria as its own entity, despite them being independent bacteria at one time.
You could look at global capitalism as being one super-organism, much like an ant colony, and individual humans are, well, workers. Capitalism doesn't care if it chews up and spits out human lives, because there will always be more of them. Its prime directive is to sustain capitalism itself.
(Note also that global capitalism doesn't care if ExxonMobile lives or dies, and it's highly likely that it'll die. It'll just get replaced by some solar energy company. This conflict between levels goes all the way up the hierarchy - the interests of your cells are not necessarily aligned with yours, your interests are not necessarily aligned with your employer, your employer is not necessarily aligned with the market.)
