Corruption and Clarity

Ok, by now, everybody is tired of corruption. That is, all non corrupt. Somebody,please define corruption. Bribery is most obvious form of corruption and hence most infamous.
The word is used so frequently, (by likes of me, atleast) that we don't look beyond some self erected walls of perception.
What about nepotism, racism, casteism, religious bigotry, arrogance born out of education (sometimes subsidised)? I wonder, if I have come across somebody who is free of all these things? Probably I didn't look hard enough.
Are we asking for moon, when we wish for corruption free society? Probably we are not made to be sterile. We will have to live with numerous bacteria inside us, copious amount of perverted thoughts inside our brains, corrupt practices around us. Adapt or spend lot of resources on pointless struggle between your "ideals" and "reality". Ideals need not be natural.
Enough if this vague talk. Started reading a Novel today. Came across the following thing which sounds true.
"Nothing was ever achieved by loss of sleep".