Major US bank launders billions of dollars of Mexican drug money.
That big banks generally make stratospheric profits means they are also the target of much suspicion and criticism, a fair bit of which is justified, as the above story illustrates. If you haven't already seen it, watch Inside Job. The problem is not a few bad apples, but a rotten system. Contemporary banking practices are the embodiment of hypercapitalism's myopic obsessions.
"It is easier for a camel to pass through the eye of a needle than for someone who is rich to enter the kingdom of God."
- Mark 10.25 (NRSV).