Legal Question in Criminal Law in California

Yes. A crime is a crime, even if the victim is a criminal, too.

I wouldn't be so certain that the house doesn't fit the definition of a residence, either. Even occasional use as sleeping quarters is enough to support residential burglary charges.

Finally, getting prosecuted might be the least of your problems. The government might send you to prison, but the illegal growers might kill you.

Duh. Burglary is a crime, no matter what. In addition, you face execution by the residents. I wouldn't take that risk lightly. They are already criminals. What is to stop them from killing you and disposing of the body?

Yes. If the law allowed people to commit crimes against criminals, our society would be much more dangerous.