The biggest problem with the lone-gunman theory is this: what if the rocket was hit in an area that didn't cause an immediate, violent explosion?
If you hit the rocket at all, something will fail, very possibly in a manner that will either be noticed before launch or discovered by a subsequent investigation. A .50 caliber bullet hole with its edges facing inward will not be missed by investigators, if there's anything left to investigate at all.
So, no. Nobody shot the rocket with a sniper rifle, because that would be stupid. They would be very likely to get caught, or to cause detectable damage that would obviously not be SpaceX's fault.
If you hit the rocket at all, something will fail, very possibly in a manner that will either be noticed before launch or discovered by a subsequent investigation. A .50 caliber bullet hole with its edges facing inward will not be missed by investigators, if there's anything left to investigate at all.
So, no. Nobody shot the rocket with a sniper rifle, because that would be stupid. They would be very likely to get caught, or to cause detectable damage that would obviously not be SpaceX's fault.