Shaykh Rabee bin Hadee Al-Madhkali [May Allah preserve him]:

Allaah [Subhaanahu wa Ta’ala] said:

‘And when it is said to them, “do not cause corruption on the earth,” they say, “we are but reformers”.’

Every sinner and every corruptor in earth does not tell the people that he is a corruptor; rather  indeed he tells them, “I am a rectifier” and he claims that he is guiding the ummah to rectification.

Al Kadhib wa Aathaaruhu As-Sayyi’ah p.26