Gawd damn, you're an idiot!<quoted text>
Cosmological redshift is seen due to the expansion of the universe, and sufficiently distant light sources, generally more than a few million light years away.
So..... They assume that light they're seeing that is millions of years old tells us what is happening today?
Sorry, that's a load of arrogant shit.
Light that's millions of years old provides clues as to what was happening millions of years ago.
It's our present understanding of light's properties and how it propagates that tells we're on the right track.
You don't care to understand because it would conflict with that preconceived notion mentioned earlier.
Feel free, next time you or one of your boys gets a speeding ticket, to argue with the officer because that radar gun is nothing more than a hoax perpetrated by godless heathens.