Looking through a scope wouldn't be so bad as your field of vision is rather restricted (and hopefully the optics you're looking through have crosshairs to narrows it down further).
A red dot though is going to be near impossible to see in daylight and over open sights at more than a few dozen paces. Throw in smoke, movement (both target and shooter) and it'd make it extremely hard, if not near impossible to spot it.
Range is another factor - no bullet flies perfectly straight and level. Over distance the projectile will drop. Depending on the speed of the projectile, wind, air temperature, altitude (air pressure), and a multitude of other factors this might only be a few millimetres or it could be measurable in feet. Light from a laser on the other hand is usually uneffected by most of these factors.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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