How does a criminal become a criminal?

In purely tautological terms, a criminal becomes a criminal by committing a crime or doing something that the law forbids.

From a variety of potential factors. Some of these factors may act alone but more commonly with a slew of other factors to create the perfect storm.

But the factors of the evolution of the criminal may include:

A list (not comprehensive)

1. Socioeconomic status

2. Neurological dysfunction (tumors, neurological degeneration)

3. Environmental factors

4. Childhood and familial history

5. Genetics