Even the Nazis had some kind hearted folks who showed true humanity...but the whole enterprise was corrupt to the core. The RC Church wileds power beyong imagining and you know what they say about power...
You are right about power. The less time a person has a position that gives them power the less likely-hood that they will become corrupted. I won't even try to defend that organized Christianity by saying they aren't corrupt. I don't see 'them' (any that call themselves a "Church") as not being in the same state right now as the Temple was when Jesus was there, the politest term is 'wayward'. Any Church should not promote any action if they don't have such instruction from Scripture. Scripture, by itself, is not corrupt nor does it promote unkind actions towards others. The corruption enters the picture when the leaders of any Church (and really, that could include any body of people that have any sort of power over others if appointments to such stations are over a long period of time, say 10 years).
The spread of Christianity left many dead in the middle ages, Scripture doesn't say anything about harming somebody if they reject the Gospel. The ones doing the spreading are to simple move on (Luke:1:1-5). It was then left of Christ to deal with at His return. Once that idea was corrupted it has never changed back to the way it was originally intended, even today that attitude is foreign to our Churches.
When the new world was being explored the boats didn't belong to Disciples, they belonged to merchants, exploring for wealth was #1, be it something they could carry back on those same boats or planting a flag somewhere and claiming that land as being theirs. It didn't matter who happened to be living there, those people were either "with them or against them". Against was the usual verdict and while missionaries may have passed out small-pox infested blankets (as an example) I doubt very much they had those blankets with them the whole time for that very reason. Again the missionaries didn't control where the boats went, they followed those with the swords, the swords didn't follow them.
So does it stand to reason that the longer a person yields power the more susceptible he becomes to becoming corrupt? What about other organizations that are independent from religion, are they immune from corruption? Our political system doesn't have anything in place that makes sure a person can only be in power for a determined length of time, that in itself promotes the likely-hood of corruption eventually overtaking them. New blood would seem to be a way of lessening the risks. If nobody could hold public office for more than (again use 10 years as an example only) then you eliminate some that hold power for 40 years or so. Nor should public offices be held by successive generations, that takes away from there being new-blood.
Now onto industry, no different from what was said above other than generations of the same family having the same power and control, if one generation falls into corruption the likely-hood of the next generation having those same traits when they first come into some authority is high.
Now the banksters, the same families have had control for hundreds of years, no need to say more about them.