Malicious Insiders

I am a student pursuing diploma in business informatics and i am currently taking a module known as “Information Security”. I have been assigned with a project related to the top 10 information security threats in the past years. I am currently writing a report regarding malicious insiders.

Malicious Insiders:
I would truely appreciate if you could answer the following questions that i have in mind that would certainly assist me in writing the report.

Q1) What is the cause of the threat?

Q2) Why is there the threat?

Q3) Nature of threat: How and when does the threat works?

I would truely appreciate if you could get back to me as soon as possible. Thank you.