People change?

I've always wondered how brilliant minds fall prey to ills and evils ? How a person with high credentials and intellect slips deep down in their moral behavior? How our leaders and executives and all other people with great power and much greater responsibility go past their standards and do some heavy nasty things. 

Corruption, bribe, cheating are just the popular ones there are so many holes in their armors that it seems impossible to imagine that sometimes back, they used to hold one. How this transformation of good into bad takes place ? Is it an instant process or gradual ?

Men and women with great passion and hard-work pave their ways to high places. They turn their day n night in studying and creating a personality which segregates them from general mass. They are seen with respect, are tagged with wisdom, knowledge and discretion. Then how this well-informed, educated and trained mind gets distracted ?

Nobody is born bad. Initially we all are same delicate, childlike, spotless innocent creatures. Than what makes us good n bad ? Is it the genetic make-up, deeds we do, things we say or the people around us ? Is there no way of knowing, detecting and sensing this braniac pollution? When and how its going to attack ? Its symptoms or side-effects ?

Questions are many and so are the answers. But none helps. This monster is growing, and its growing with speed higher than ever. Some are resistant, some are resilient. But for how long ? We all know how great technologies which we proud today, helping us in building our nation, uniting it and controlling it, can be used disastrously if got in wrong hands. How some people bend rules. How the laws and rights are misused ? How the data [which we believe to be encrypted and super-safe] collected in the name of protection and benefits and fast and easy transactions holds the capability of stalking and monitoring our each and every move ?

How the things/rules/laws and people which were once good turn into some friendly monsters. Those who are fighting against it, how long before they fail to abstain ?