I don't think DDBSA is going to kill me, but it is a surfactant like shampoo or dishwashing liquid or laundry detergent great for what we use it for (cleaning/sanatizing). Not really something I want in my beer though. That's why I follow the instructions on the bottle and let it air dry before I use my brewing equipment.
All those other chemicals you mention people have been eating since before we knew the name of them, except that the collective of them is "beer". Especially the ethyl alcohol, I mean most people don't go to all this trouble to make wort.
Dihydrogen oxide on the other hand, yuck, people all over the world are dying from that stuff. I think that's why they invented beer in the first place.
Disclaimer: I'm really not trying to start any funny business here. I am on the fence about this since everyone including crazy sanitation guy is soaking everything with a Starsan spray bottle. As a new brewer, I am trying to find my way through the woods without just nodding and following the crowd. I believe my position is based on reason, but if someone can convince me based on solid data, I am open to it. I considered starting a thread somewhere else and will if others think the conversation is valid, but don't want to be a troublemaker.