The science of statistics is based on generalization. When one generalizes one doesn't say every last one of such and such. One says "the biggest number of." That may be only 30% if there are many groups, the biggest of them 30%. Bribes in developed countries are just more subtle and often don't take the form of cash or a bank deposit. Few days go past without news of someone getting caught out being bribed.

Where I live the full-sized public buses are frequently empty and rarely have more than five passengers. They tell me the state finances them. That's just one of many instances of public money being poorly spent I see every day.