What causes evil thoughts?

Answer 1

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;

Because that which may be known of God is manifest in them; for God hath shewed it unto them.

For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:

Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.

Professing themselves to be wise, they became fools,

And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.

Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves:

Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen.

For this cause God gave them up unto vile affections: ( Romans 1: 18-26)

Answer 2

The way they live or how they feel about how they live compared to how good people live and how much money they have. Getting a feeling that they should deserve stuff like that not them rich people, and turn evil doing crime all the time and becoming a criminal expert day & day