I understand you very well. Indeed, if this was about some other sign, I'd agree.
But since it is a protection sign it is a special case, and it's purpose shouldn't be trivialized. Just remember horror games where dangerous zombie girls approach you, wearing a white nurse dress with the red cross.
But that's just my personal view.
In general, I also tend to your point of view, since I read "1984" twenty years ago.
Imagine Microsoft would forbid the use of a white x on red background as an exit button.
Or if we weren't allowed to use images of cogwheels, as it represents the software C2.
Or if a name of a software company's service would be protected, so that we could never again use the word "steam" in any other way than referring to that service.
So, yes, I hear you. It's just that these international protection signs really are a special case that should be respected.