If you want to reach someone, the best way to do it is to be prepared to view things the way they do. If you can’t set aside your prejudice assumptions on the why/how they have come to their viewpoints and really empathize with them, you’re not likely to get far.
Doesn’t this kind of assume humans are a central focus of the simulation? What if the universe is a simulation, but the rise of humans was an unintended result in the simulation. Maybe there is actually other civilizations elsewhere that are the actual focus, or just to get a look at the diversity of life that would form throughout the universe. Or, maybe life in the universe isn’t the focus at all and they just wanted to look at the evolution of galaxies and the like.
Or maybe I am misunderstanding your point. I kind of like the idea of being an unintended result of a simulation meant for other things though.