I have suffered a martyrdom from their incompetency and caprice.

我因他们的无能和反复无常而殉道。

He listened to her moans about lost customers and bad debts, the swindling ways of Mr. Johnson and the incompetency of Hugh.

他总是全神贯她发牢骚，说她怎样失去顾客，怎样放呆帐，约翰如何欺骗她，以及休多么无能，等等。

His incompetency is reflected in his poor choice of appearance.

他的无能反映在他糟糕的外表选择上。

So to answer your question directly, you ask what the cause is, it's incompetency and perverse incentives.

所以直接回答你的问题, 你问原因是什么, 这是不称职和不正当的激励。