People, parents, advocates, therapists, medical and school professionals, throw around words like prevention, cure, and treatment when talking about autism as if they are interchangeable. These terms are rarely explicitly defined. It's just assumed that everyone in the room knows what you're talking about. This vagueness and imprecision with language muddies the waters when trying to have meaningful discussions about helping autistic people.
Let's start with the word prevention. Prevention is proactive, stopping something, something you think is bad, from happening. There are a lot of people invested in finding ways to make sure more autistic people don't happen. Their primary tool is the flood of information about the genetics of autism that has become known over the last decade or so. I'm excited about the great body of knowledge about autism that science is amassing. But as someone raising autistic children and advocating for society to value the humanity of autistic people I can't say that I'm excited about using these scientific discoveries to find ways to prevent others like my children from coming into existence.
While some search for ways to use genetic markers to eradicate autism I'm not reassured by insistences that prevention is only for the most "severe" cases. Severity here being defined as those people who would never be able to dress themselves, feed themselves, or speak. This raises several questions. Who defines the severity of autism? Right now, the criteria are arbitrary at best. When is the determination of severity made, before conception, pre-implantation, first trimester? Good luck with that moral and ethical quagmire. Arguing that people with more intense needs shouldn't exist doesn't make the argument for autism prevention any more palatable.
Throw into the prevention mix those who still cling to disproven causation theories about autism. Their beliefs about what causes autism lead them to choose from a range of preventative measures that require significant financial output, emotional investment, and leave them vulnerable to adverse health outcomes. We've already seen the results of some those choices with recurring outbreaks of previously rare vaccine preventable diseases. I don't want to repeat myself just now so I'll leave that topic alone for the moment.