if you really want to know the person true self give him 3 things: Money, Power and Access to Sex. With this 3 things you can know any one true nature. So no be power dey corrupt, power only reveals corruption.
you just ended up contradicting yourself.
Everyone has his own tendencies depending on his upbringing and beliefs system. Their are people that are born rich and whose parent instilled in them good morals that never had any issue coping with wealth and so regardless of the money, power or sexual privileges that comes their way, they don't easily get moved by it.
Power and vices like the ones you pointed out mostly affect those that have not had it before and that have been craving for such privileges secretly without anyone knowing it, ones they get opportunity to access those privileges, people might feel that they have changed become of money or power not knowing that it is the inability to funding their desire that made them look calm.
I know power and money comes with it own spirit and that if you are not careful, regardless of your belief system or standard of upbringing, it would throw you off your feet but their are people that will stand their ground regardless of the privileges you present to them.
Don't underestimate the power of belief system, e get people when even if you give them heaven and earth or bring strippers full ground for their front, as long as them believe say those things an vanity, e no go move them aswr