I guess you're just too mentally and intellectually limited to understand the idea that in order to argue court cases in the modern world that often involve highly complex, technical scientific, medical and engineering related issues, an attorney has to study and familiarize him/herself with the very same highly complex, technical aspects which are at the heart of these matters.
No they don't. They just hire experts to do that sort of thing. The lawyers can be scientific illiterates for all it matters, and they often are.
Lawyers need enough functional understanding to ask the right questions, cross-examine opposing experts, and translate complex concepts for judges and juries.
Lawyers who practice in technical niches—such as patent law, intellectual property, or environmental law—often hold undergraduate or advanced degrees (like a Master's or Ph.D.) in fields like chemistry, biology, or computer science.