Should all those who commit evil expect to suffer severe punishment?

Hell does exist. It represents the lower region of our galaxy and is composed of numerous infernal planets.

Here are some examples of punishments.

Criminals eager to satisfy their desires and sensual pleasures, including delighting their taste buds by eating meat, fish, and eggs after killing innocent living beings and committing a heinous crime, are condemned to eat their own flesh, be tortured by fire, or be devoured by other beings in the same condition as themselves. Those who kill and eat the flesh of land and water animals will go to Maharaurava, a hellish planet designed for those who kill animals, such as herders who take their animals to the slaughterhouse, slaughterhouse sacrificers who kill them, sailors aboard trawlers who kill them in the open sea, fishermen, butchers, and fishmongers who sell their flesh, and carnivorous humans who consume it.

Men and women who have based their existence on the growth of illicit carnal desires outside of marriage are placed in all sorts of horrible conditions on the hellish planets Tamisra, Andha-tamisra, and Raurava.

Material existence is based on sexual life. Indeed, all materialists, forced to undergo harsh tribulations during their struggle for existence, base their lives on carnal pleasure. This is why spiritual civilization only allows sexual activity in a limited way. It is intended only for married couples, solely for the purpose of procreation. Those who, for the sole purpose of satisfying their senses, resort to carnal union in an illegal and illicit manner must expect, both men and women, to suffer severe punishment, both in this life and after death.

In this life, they may be struck by infectious diseases such as syphilis and gonorrhea, and after death, they are liable to experience a thousand hellish sufferings. The Lord strongly condemns illicit sexual activity outside of marriage, adding that those who produce children through illicit unions must go to hell.

During the transfer from one body to another, the soul is carried away by the servants of Yamaraja, the judge of the guilty and lord of death, appointed to this position by Krishna. They first make it pass through a certain type of hellish life so as to accustom it to the conditions it will have to live in its next body.