Baseball and criminal sentencing are different things, and they should be treated that way. But since 1993, California and 22 other states have adopted so-called "three strikes" laws, under which someone convicted of a third felony faces life in prison.
The presumption that the accused is innocent until proven guilty is a bedrock principle of our legal system. Also, one cannot be convicted unless the state proves each element of the crime beyond a reasonable doubt. These are essential protections that enable the accused to present defenses, question allegations and call witnesses on their behalf before findings can be made.