Noun for an irresponsible person in a position of power

Question

I am wanting a noun for an irresponsible, careless, inconsiderate person who is in a position of power or control or leadership. For example:

[noun]s are the downfall of our system.

Answer 1

Incompetent

Dictionary definitions

Cambridge Dictionary:"someone who does not have the ability or skill to do something as it should be done"

dictionary.com: "an incompetent person; a mentally deficient person."

Macmillan Dictionary:"someone who lacks the ability or skills to do something"

Oxford Living Dictionary:"An incompetent person."

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Oxford Living Dictionary (on the adjective):

"Not having or showing the necessary skills to do something successfully."

"Not qualified to act in a particular capacity."

Examples (suited for your question)

The first three are taken from Oxford Living Dictionary, the last is taken from Cambridge Dictionary.

"‘After reading an article in a daily newspaper this week I am left to conclude that our elected leaders are a bunch of fools, incompetents and idiots (take your pick as to who falls into which category).’"

"‘History is littered with despots and psychopaths, murderous dullards, evil geniuses, deadly incompetents, calamitous brutes of all descriptions.’"

"‘At best they have been portrayed as bungling incompetents.’"

"The country's being governed by a bunch of incompetents."

OP's sentence

Incompetents are the downfall of our system.