Yes, they made announcements without clearly thinking how they will be perceived. I agree that it was unnecessary and then dying suddenly didn't look good.
Nevertheless, if I had a situation like where I know for sure that my odds are not great, I would do the same. I would live full life today because tomorrow I could be dead. Herman Cain most likely knew that he is not going to last long. It didn't make sense for him to be afraid of death and isolate for indefinite period of time. His bravery is an example to follow.
Isolating was the only way. A lot of elderly in the UK did this successfully and never got covid. Lockdowns, masks and schools closures did not affect the spread significantly. We know this because Sweden did not mandate these things and had about the same amount of people getting covid until vaccines arrived. The benefits were that Sweden had less mortality from other causes.
How can a request for evidence be absurd?