I noticed many people believe, that Western countries ranking low on corruption indexes, shows they aren't corrupt as hell.

To me this just means it's at a higher, much harder to prove level.

Instead of starting at the cop level (which is still possible with connections), it starts at the points where multi-millions can be made without anyone really noticing.

E.g. farm land > residential use, construction projects, sale of government properties, favors for corps etc.