ethanol in gas bad for our cars?

Unless you are pouring solvents into your tank, (which is almost NEVER a good idea BTW, but that's another topic) the fuel and lube additives will contain some variation of a base oil + additives. Not zooming THAT far out, I'll eat the Cheezwiz, thank you very much. The base oil or carrier constitutes most if not over 90% of the product in some cases. That small percentage typically comprises the additive package reflecting most if not all of the nasty bits in the MSDS yarcraft alludes to.

Snake oil. The snakes come in all different flavors, or "tools" for various jobs if you will, but they are all basically some type of base oil with a few goodies added, that are for the most part not very effective compared to the claims made for them.