"The first answer that comes to my mind is: to get the result of crashing two galaxies."
If such a god were the all knowing god of the Bible or any similar religion he would already know what the results would be before he even creates those galaxies.
"If, from the micro perspective, you happened to live on one of those small molecular structures facing destruction you'd have one view."
I think the OP had a much more benevolent creator in mind who counts every hair on your head.