The target audience is a lawyer.
I know California has this law, but in a more general sense, a lot of these warnings are based on litigation and the fear thereof.
Tangent:
I'm a technical writer. There is a long history of this kind of thing in the vast majority of technical documents that are provided to the end user. It's not looked upon kindly by a lot of technical writers and academics who teach technical writing. If you're looking for citations, you can check out "Writing and Technique" by David Dobrin. He dissects the "user manual" for his coffee grinder (IIRC), which includes such warnings as "Do not use outside." Now, we all know these rules are meaningless, day to day. You could use your coffee grinder outside for a decade with no ill effects, unless it was raining. Or a walnut fell from a tree into the grinder while it was running. Or some other wildly unlikely scenario. But the corporate lawyer needs to cover the company.
He argues that this isn't technical writing at all. I'd probably concur. And yet, here we are. These warnings are plastered everywhere and, yet, people ignore them. Or laugh at them and go through their life not killing themselves with their coffee grinders. And people wonder why the documentation is often useless and filled with such warnings.
A co-worker bought a chainsaw. The manual was entirely filled with warnings. Completely. Now a chainsaw isn't exactly a safe piece of equipment, and so some warnings, maybe even all of them, had a point. But there were no instructions on how to use the thing.
I don't want to blame the lawyer. I can't imagine they like being paranoid, they are just protecting the company.