The baby absolutely didn't deserve to die like that. The parents, on the other hand, are experiencing the natural consequences of their own choices, literally what their actions brought on and deserved. Nobody has to say, "I told you so", but neither do they deserve anybody's sympathy.
This is no different than parents refusing to get a car seat for their child because they think seatbelts take away freedom, getting in a car accident, and the child dying in the accident. The child's preventable death is the parent's fault. They created the environment that was unsafe for the child because they were arrogant enough to believe they knew better than decades of evidence. In this car seat scenario, parents might even be charged with endangerment or negligence.
Or the grandmother who didn't believe her granddaughter's coconut allergy was real, because she knew better than the baby's doctors, and put coconut oil in the poor baby's hair and killed her. That grandma doesn't deserve sympathy for what she did.
Forgive me for saying this, but the final Kelpian design looks much, um, tastier than the original one. I can't imagine Terrans looking at a green and brown multi-eyed triangular headed alien and think "delicacy".