Luckily most predators don't use headlights.

Are deer relying on hiding from predators or are they just relying on being able to escape predators? Deer are fairly large animals so they're kinda conspicuous already. I think they also don't get white coats during winter, so they stick out from the snow.

Antlers are weapons. Most predators will avoid the food with knives on its head. From a darwinian perspective, it is also probably better that the wolves pay attention to the well-armed male deer rather than the productive females that do not have antlers.