My personal comparison is: If a postal worker opens your mail is that okay? If your window is open but your curtains are closed, is it okay for someone to stand

My personal comparison is: If a postal worker opens your mail is that okay? If your window is open but your curtains are closed, is it okay for someone to stand outside your house and open them? Humans protect their privacy with mostly pathetic measures due to an intrinsic sense of trust, but that doesn't give other humans the right to erode that trust.