Why is voldermort evil?

Answer 1

It was most likely to do with his childhood in a muggle orphanage, which was not very pleasant, and therefore not having a very good idea of what is good and bad. He was probably teased while he was young, and when his magical abbilities came about he enjoyed using them to torment his abusers, and because he was never caught and punished he didn't know it was wrong. For example, Harry was punished every time he did magic that was noteably wrong, meaning he had a better understanding of what was right and wrong, whereas young Tom Riddle was never told off.

This is my beleif, and that Dumbledore failed to make an impression on an already set mind of the soon to be tyrant.

(To put it simply, bad childhood made him want to be feared, as it was the only feeling he had received and dealt out.)

Answer 2

Voldemort's evil nature can be attributed to his desire for power, his lack of empathy or remorse for others, and his willingness to use dark magic to achieve his goals. His fear of death and obsession with immortality also contribute to his ruthless and malicious behavior.

Answer 3

He was created by nightmares apparently and also his father was an evil wizard.