This is a DIYer forum. I have many years (going back to 1992) of communicating with homeowners that are DIYers or wannabees, my experience is that the vast majority of them are not wanting to spend $200 for a comprehensive water analysis.
What you see as an attack I see as presenting my thoughts and clarifying them when needed. I notice that you have made this debate personal while I have not said a word about you; good or bad.
I am not going to convince you and you are not going to convince me that all private well owners need or should have a comprehensive water test and that the government should require them to get one. I say the government or better, dealers and salespeople should inform them of the potential for health related problems and let the homeowner decide what they want to do.
I started doing that individually with my prospective customers in the late 1980s but the reception I got was not good. They saw it as a sales ploy to sell more equipment and I simply spoke to whatever concern or problems they had with their water except, I always did nitrates and Coliform bacteria tests for them (private well owners) at no charge. That was until I started selling over the internet in 2002 where I physically couldn't do it. I also tested for hardness, iron, manganese, sulfates, chlorides, pH, copper depending on the pH, TDS etc.. At no charge and with no obligation.
BTW, you haven't shown me any "studies showing long term affects caused by contaminantes in our drinking water". And they should be done on private well water, not all drinking water.
As to arsenic and such, I suggest separate tests for them as opposed to a $200 comprehensive test that you are for.
As to liability, I don't see how a homeowner would be able to say I should have tested for something that they have no way of proving was in their water when they bought a softener or filter etc. from me. My defense would be that if they knew it was there and were concerned about it, why didn't they mention it and want to buy the remediation equipment from me when they bought other equipment from me. Until 2006 I kept a printed copy and database record of every water test I ever did. That included printed copies during a year that I worked for a large regional farm supply company running their water treatment department in 1989.
Without doing your tests, how does a dealer risk anything; what is his liability? Hell man, most are not licensed for more than driving a vehicle. You aren't one of those guys that want everyone licensed by the government to sell a softener are you?
Yes I know of the problems with lead in the human body. I wonder what water companies will be doing about their lead problems due to their acidic water and lead service lines like were used due to plumbing codes in Chicago until something like the 1980s or 1990s. Or is the government finally getting their foot in the door of all private well owners as I have thought they wanted to do since the mid 1980s and especially since Water 2000 was it when the old Rural Electrification program was converted to looking into well water quality and running water lines all over and especially the west?