you are absolutely correct on that one....but I am hoping that by writing this and just one person see's it and it changes them it will be a good thing.....
thanks for all the responses!

It would be wonderful of the person that receives email 2 respond, as well....I would rather read a "kiss my a**" email, then 2 just get ignored.

You could look at this in two ways. Whilst some think it's only courteous and polite, others might think that it's better not to risk hurting their feelings. And whilst they're hurting your feelings anyway, it doesn't mean they're rude or nasty. On the contrary, they're taking your feelings into account. You can't really begrudge poor judgement.

That said, I agree that it's only fair to let them know. If they've taken the time to message you about their interest in you, then the least you can do is repay that by letting them know that, for whatever reason, you're not interested.