Why Would You Say Evolution Has No Purpose?

Questions about the claim that evolution has no purpose and whether the fact that people who have aphantasia are unable to form mental images shows that the ability to picture something is based in chemistry rather than a soul.

• Why would you say evolution has no purpose when it’s a fine-tuned process that ensures the propagation of life and is anything but random since it’s controlled by a survival-fitness feedback loop?
• Since people who have aphantasia are unable to form mental images, doesn’t that mean the ability to picture something is based in chemistry rather than a soul?