Or avoiding an aircraft fitted with no lights.
With all due respect 50-50 how do you know how many you didn't see but were lucky enough not to hit?
Wig wag lights would certainly give certainty that the light you see in the far distance is an aircraft. A few times I have seen a very bright light apparently coming at me and fretted about whether it was another aircraft and if so was it at my altitude. On all occasions it turned out to be either an oil rig light or the sun reflecting off something.
Of course not wig wagging doesn't mean it's not an aircraft but if most had it fitted it would speed up the recognise and avoid action.