All law is inherently complex. The bible breaks has a list of 10 major rules. One of which is Thou shall not kill/murder, which is a pretty simple and clearly stated rule. Humanity in general has agreed that killing people is not in humanity’s best interest. And yet, when people are killed we still need to have the legal system step in and talk about it.
The legal system exists because life is filled with shades of grey, sometimes murders are legally permitted. Sometimes someone else owns a photo. I’d much prefer the disagreements to be via sitting at a desk arguing in front of a guy in black robes over a few weeks instead of “Meet me outside at noon and we’ll figger out who’s right.” It’s the price of civilization like taxes for roads or fire departments.