You have no moral obligation to have children at all, even if they’ll predictably have a happy life. So if their life will instead be predictably horrible (or if they will predictably ruin the lives of the people around them - plenty of severe mental disabilities seem much less horrible for the people themselves than for their caretakers), it’s very reasonable to avoid it.

No it is not wrong. Abortion, even of a healthy fetus, is not wrong and you shouldn’t let anyone tell you otherwise.

In states with heavy abortion restrictions, there is a surge of dumpster babies.

Instead of bringing a clump of cell to term only to abandon it, might as well just get rid of it altogether.

And let’s not forget that the lives of the immediate family are also impacted negatively.

Taking care of a child is a lot of work. Taking care of a child that has a disability is much more work.