Ignorance of the law has never been an excuse. You are expected to know all the laws that apply to you.

The law being so wide ranging, complicated, and subject to interpretation based on previous decisions (in may jurisdictions) it's practically impossible to know definitively every law that applies to you, even for an expert.

Now, knowing what the law is in specific, narrow areas that you're operating in, or with sufficient budget to hire experts, that's something different, and might be closer to knowable.

I fully agree with you, but that doesn't change anything about my statement. Even if you don't know what the law is you are still responsible for following it correctly.

Maybe the point I was trying to make is whether the statement is practical and/or reasonable or not.