After a devastating fire in Yosemite Valley some years back, the state of California began brush clearance operations in that area with a vengeance. I've driven through Yosemite in the summer, and have seen mile after mile after mile of baled forest litter along the highways.
I only ask out of ignorance, and the fact that when I found it was illegal, my first reaction was "So What?".
When it comes to obeying a law that's likely unenforceable, and saving my house from burning flat, that's an easy choice.