Can ABA really treat autism?

I was reading a blog from Susansenator and there was a comment saying that ABA does not work, it does not treat autism. What the person say actually kind of make sense too. He came out with some questions that really make me wonder whether i'm doing the right things for all these ASD kids. Why do we have to teach them eye contact? Do that really feel happy when they are smiling? Is pacing up and down really that bad?
Actually when i really think of all these questions, all the answers are a big NO.

We teach ASD kids eye contact so that we will know that they are looking at us instead of rejecting us. In a way, we are making our lives easier working with ASD kids. And i don't think that pacing up and down is wrong, it's just that it's not good for us as we will get disturb by them. In actual fact, we are trying to make these ASD kids blend into our society, conform to our social norms. So they are of no difference as compared to us. The objective or the main motive of ABA to treat autism is to make them indistinguishable from regular kids. By saying that, it does not mean that they have recovered (in fact there is still no cure for autism). All i can say is that they can behave the same as regular kids and act like regular kids but i really have no idea whether they are happy. So, should we really use ABA to treat them to become indistinguishable or should we just leave them alone? (i think they will in fact be more happy). I really don't have the answer. Can someone tell me? Till now, i'll still practice ABA and treat them cause i really want them to be treated like regular kids.