Yes, unfortunately, due to human nature corruption is everywhere but the big difference between many democracies such as the USA/UK and many dictatorships such as House of Saud, is that in democracies the corrupt leaders can be held to account, leaders can be voted out of office, leaders serve the people instead of the people serving the leaders. No government is perfect, far from it, but you have to ask which is the least bad.
You see
@RedPed the fundamental difference is that I can criticise my leaders on this forum and protest against them outside the houses of parliament without fear of being imprisoned or executed.
The number one responsibilty of a democratic government is to protect the people it governs which in some cases means it has to make foreign policy choices and do bad things and the choices are not always correct.
BUT this is considerably less bad than a government that imprisons and executes its own innocent citizens for protesting, sexual preference,oppresses 50% of the population for being female and is unaccountable to its citizens.