Just light, what about the rest of the electromagnetic range of emissions? Gravity can push, ever tried to roll a car uphill? The weak and strong nuclear forces are also from Bosons, why are light and gravity special? Did you know you can send enough light into a region that you can cause that region to pass into a blackhole, it's a called a Kugelblitz.
When a physicist says 'light' they mean electromagnetic energy of all frequencies - not just visible light. All the forces become unified at high temperatures. The universe is thought to have 0 total charge, so even the attractive coulomb force does not counter gravity -- it in sum total, does nothing. Gravity doesn't push the car down the hill, the car pushes you, because it itself is being pulled, silly semantics.
The gravitional force is a negative, it destroys separation and distance. Light and the other forces create separation and distance.
In your black hole example, the light has a momentum, and that doesn't vanish if a black hole forms, the black hole will continue moving.
>Gravity doesn't push the car down the hill, the car pushes you, because it itself is being pulled, silly semantics.
That was my point. You're looking for some wonderful unifying human beauty. I can make the same arguments.
>In your black hole example, the light has a momentum, and that doesn't vanish if a black hole forms, the black hole will continue moving.
My mistake, it's a bit more complicated, what if you pointed two lasers at each other and created a pulse from each of such magnitude the when the light pulses pass by each other the Schwarzschild radius is passed? The blackhole is formed from the photons and nothing can escape the interior of the blackhole. Too much EM radiation can destroy separation and distance.
Rapid fire of some refutations.