I disagree with you on the general but agree on the specific here. I think parents need to be reasonably involved with their children even when they are students, but here the child seems to do well so there is no reason to worry
OP is talking about a full grown adult. Not a child.
Perhaps it could have been more a bit more tactful to reword to avoid saying "child", like saying "your son is doing well" in this case.
"His son was in an accident" could equally refer to an adult.
This is an interesting tangent to me. What makes a full grown adult? Is it being able to drive a car? Being able to serve in the military? Being able to drink? Vote? In the state where I grew up, these were all different ages.
And then there’s the scientific notion of when the brain is “finished” developing and maturing in the mid- to late-20s.
Maybe we have to reprioritize your focus.
Sigh, you know, it's the same old story like back in kindergarten.