No doubt. How many times are you in a stand as darkness closes in and trees or bushes suddenly look like deer during the legal shooting hours? As experienced hunters, we realize that low light requires extra caution, but to the guy that never hunted before, it is another story. I am in no way justifying mistaking a person for a deer, nor am I downplaying the seriousness of it in any way. A way we can all help is to mentor new hunters and stress this over and over. Also, we can help out in the local hunters ed courses.
I'm quite possibly the King of thinking every thing I see is a deer in low light but Its never even crossed my mind to shoot something that I think might be a deer.