I'm also in the most vulnerable age group, and I certainly respect your right to hold the opinions that you do. But people are different in respect to how much risk they are willing to tolerate as well as how much freedom they are willing to relinquish compared to how much good is likely to result. As a society, we elect representatives to reconcile those conflicting opinions, and I believe everyone should follow the rules that result whether or not they agree with them.
Our May 2020 trip didn't happen, and October is looking iffy - we won't go if masks are required. But I fervently hope that by our next planned vacation in May 2021 that masks will no longer be required. At that point, if the virus is under control to the point that the government is no longer requiring masks, I hope Disney won't either. I would probably be more willing to wear a mask "even if it only prevents one death" at a doctor's office or grocery store, where people need to be. Disney is a vacation venue - at some point, if people consider the risk too great, it will need to become their personal choice to stay away. That's the other way they can avoid the disease and stay alive, and it probably will work better than masks.