I'm sorry to revive an old thread like this but I found it and I saw his last question and I know I used to wonder the same thing and figured I could help out someone else with my understanding of it at the same time.
My understanding is that the methanol was actually added to ethanol (moonshine) to denature it so that people couldn't drink it. That then perpetuated to "all moonshine has methanol" by way of people not being completely informed and gossiping, etc. The other possibility was, in some cases, moonshiners DID add nasty ingredients to their shines such as brake fluids and stuff. Some of those could be the reason for blindness back in the day.
Also, methanol is sometimes called wood alcohol or wood spirit because it was a byproduct of destructive distillation of woods. (This last bit is from the Wiki page because I remembered part of it but didn't want to fly off and miss something)
Lastly, do note that there sometimes are small amounts of methanol in fermented wines and beers (as Charon said) but, as far as my understanding of it goes, these are nowhere near enough to harm you.
