Firstly, it is impossible for an object with mass to travel at the speed of light, Light does not carry any mass in the traditional sense, as it is composed of massless particles called photons.

The energy needed to create light is not related to the energy needed to sustain a certain speed.

The energy from a galaxy's light is spread out over a vast distance and is not concentrated enough to cause any significant heating or burning of nearby galaxies.

And also we not observing these faraway stars & galaxies using normal light.

But I respect your opinion, I may not agree with it but that's a beauty freedom.