I use lots of things, chemical and no, in different ways.
All matter is made from atoms. All substances have a chemical makeup. Water is a chemical -- not just water coming from dyeing plants, but ocean water, tap water, water in spit. And you know, if you (or esp. a baby)drink too much water, it can kill you.
I use, for example, poke root to heal myself of mastitis. Very harmful to kids, in any kind of quantity. If you soak your breast in poke root you can't nurse on it for several days. Nasty stuff. But powerfully healing used right.
I use dye-free, fragrance-free vegetable-based soap to wash my clothes and sometiems my skin and also my house. But I don't eat it.
I use vodka to disinfect. No -- I DON'T buy organic vodka for this purpose. Better than lysol, IMO. But nothing I'd give my kids.
Dharma dye has many downfalls. So do the powerful mordants needed to seal natural dyes.
Just because a thing is natural doesn't mean it's good. Lots of natural things are harmful, toxic, carcinogenic, and the like.
Judging a person for dyeing with KoolAid is insane. What if I crushed up mistletoe berries to dye with? Would I be a good person for harvesting or a bad person for using a toxin that I wouldn't eat?
It is natural to judge and to be unkind, and easy to do in faceless forums such as these. Natural or not, it's still not nice. And I bet it doesn't dye up into very pretty karmic colors.