Detecting motion is relatively easy to do, but determining accurate details of said motion, on a universal scale, is quite a different process. Observing the path of an object from a minuscule point of reference, at a distance of millions, or billions, of light years, makes it impossible to establish whether you are attempting to measure a straight line, or an arc. Go to a beach and imbed one stick in the sand, pull the string taut, and draw a circle with the other stick, around the first. Here are a few more points to contemplate. An infinite arc will appear as a straight line from any perspective other than an infinite one.
Mankind is within the flow of the infinite.
Humans evolved, exist, and will eventually become extinct, within the eternal passage of time. A person is made up of matter and energy that has always existed, and will always exist, in one form or another. These chromosomes will persist in living things for the duration of life on this planet. That which is best for mankind, is also best for the individual members of mankind. Ground squirrels use a high pitched squeak to warn all neighboring squirrels of an approaching predator.