As short and as simple as put What is the root of Evil?
What is the source of corruption?
Why is suffering such as homelessness, and mental illness so great?
I'd say I lived a while, and without pontificating or preaching or anything like that, just from an honest even if brutally is the reason that despite knowledge or intelligence, some would still choose wrong. I mean this mostly as a question for as brief as possible responses, with as much honesty and less knee jerk of reactions as possible.