If animals evolved independently on mars, it probably means the universe is full of life and that animals have evolved many times before on other worlds.

If so then we should expect many of those worlds to evolve intelligent life, and some of those worlds to still be around in the present day and colonizing, building stuff, or possibly even contacting us.

And yet there is no sign of any intelligent life out there despite intense scientific effort to search for it. This increases the probability of the hypothesis that most intelligent life goes extinct, which means we will probably go extinct.