I question how "easy to apply" the law is. It's necessary to have a set of facts before deciding "what the law says", however one of the (many) reasons it's so

I question how "easy to apply" the law is. It's necessary to have a set of facts before deciding "what the law says", however one of the (many) reasons it's so difficult to apply the law in practice is that establishing "the facts" for real world situations is hotly contested by lawyers for each side.