I do see the "death to America" in the logo now, but to me it says "heavy water", deuterium water D2O. I guess my mind thinks according to my knowledge and experience in science and technology ahead of evil and destruction. It may be a hidden message of evil but I just don't think that way on first sight.

Yes.

I also wondered why they were requesting I roll a D20.

Yes. But they actually use word "destroy"