More problematic may have been using sugar of lead to sweeten wine. http://www.smithsonianmag.com/arts-culture/sugar-of-lead-a-d...
Nor do I trust certain natural additives or physical processing methods; chemical is full of unknowns, but natural can be harmful too. I try to avoid white flour and added sugar, for example, and I have my doubts about how good of an idea it was to breed all this sweetness into modern fruit...
Nature is chemicals. What you are saying is that you trust the chemical outputs of the chaotic natural environment more than the ones produces by scientists.