There are so many good points in this thread.
I just read recently where a lady has a problem even with the trace amounts of heavy metals used in dyes such as zinc, chromium, lead, copper, mercury, and nickel. Her liver will absolutely not tolerate any amount of these metals at all.
"Garment finishes for wrinkle-free, stain resistant, flame retardant, anti-fungal, anti-bacterial, anti-static, odor-resistant, permanent-press, non-shrink, softening agents, and the other easy care treatments that are applied to new clothing can be especially harmful for people with chemical sensitivities … which is basically all of us – it is just the degree of sensitivity that varies" quote from LotusOrganics.com.
This information here:
http://www.masterstech-home.com/the_sewing_room/Articles/FabricDyeSafety.html states that it is difficult to rinse the toxins from hand dyed fabric, but that most of the toxicity occurrs in handling the dyes themselves.
I am not a big organics type of person, but the point is true. There are loads of chemicals, some even required by law, that people can be sensitive to. Not all of us and maybe not even most of us. I, for example, cannot use any form of blue dye in my hair and soap products without morphing into a grotesque mass of flakes and boils. One time I drank 2 teaspoons of blue cold medicine and was quite alarmed at what returned for a visit the next day. If I make a big noise about my blue dye allergies, I am sure that I could convince a government official that blue dye is a menace to society. I could find research to prove my point and have it removed from the market. I am sure of it, even though the risk of it affecting anyone else in such a manner or worse is miniscule. But I would be wrong to assume that the millions of people on earth are going to be grateful to me for saving them from the menace of blue dye. Most people do not have a problem with it, have grown up with it, raised their children with it and they are all fine and do would not understand how bad it really is...for at least a few people.
At the same time, the government knows very well that birth control pills cause blood clots (which nearly killed my dear friend) yet to this day, I can see birth control pills being advertised on television stating in fact that they do cause blood clots and that people can die from this, yet apparantly the government deems the potential benefits from these horrible drubs far outweigh the possibility of death, which is far more reasonable than having a problem from dyes in washed fabrics.
As the OP stated, and as the point has been reiterated over and over here, the poisons are everywhere. Dangers are everywhere. The reason one is outlawed and one is mandated is the purpose of all legislation...revenue. It has nothing to do with anyone being concerned about anyone else.
I am not in any way diminishing anyone's experience with ill effects from lead. But it cannot be legislated away because it does occur naturally, and that is why there are fines resulting from its use. Substances that can be eliminated are generally regulated so that the government can get its hand in it. If government makes a company stop using something that does not occur naturally, there is no money in it for them.