You can believe whatever you want.  Most people do believe what makes them comfortable.  And some women choose not to carry Downs babies to term.  There are 2 points to the article referenced, neither of which has anything to do with parasites or the right to an abortion.

1. There is inaccurate information being given to parents whose fetus is identified as Downs as to prognosis.  Telling people to make a decision based on false information is unconscionable.

2. Killing off fetuses with Downs syndrome is not eliminating Downs syndrome, it's eliminating fetuses with Downs syndrome. There is a difference. This is not some great medical breakthrough that "eliminates Downs". It is not remotely analogous to vaccines eliminating communicable diseases.