If a corrupt man is given power,there is no way that he wouldn't display his corrupt habit. If power is given to someone,the way he operates without power remains the same,and some can hide their corrupt habit to deceive people but it can't be hidden for long. If you see a man that is in power and is corrupt,this means that he has been corrupt ever since the beginning before he came into power.
Let's take for example of the corrupt politicians that do everything in their power to make sure that they win elections by rigging it or even kill people for power. In my country,I will say that corruption leads to power and not power leads to corruption,because we hear big lies before elections and we see how the votes are sold out to a candidate that has paid for it and at the end the wrong candidate that is not the people's choice will be put into power. Meaning a corrupt leader that used money to rig election, and he will continue with his corrupt act in power.
Yes you are correct about what you are saying, if a bad person has the power over all he's bad character will definitely show off one day even if the person is trying to hide it for people to see, although in this life you can't satisfy everybody because what you thinks is right it might be wrong for others and that's the nature of life.
Some people were not corrupt while they were common but untill they have the powers that's when they became corrupted, if a person is bad I don't think that the society will choose the person to lead them.
Well I am also a good Nigerian and I believe that there are good leaders out there but the real thing is that as long as you entered into the political seat those corrupt politicians out there will poison the mind of the good ones with money and if the person says A maybe after everything he will start think B so my conclusion is that let's do our best thsts all.