What other reason would you have for hoping his base wouldn't wear masks, if not that something bad should happen to them because of it?
It's not only Trump supporters who don't want to wear masks-I know quite a few Democrats who don't like wearing masks and think this is less serious than it is, including one who had it and said he doesn't want to be tested again unless he's on a ventilator because he said the medical staff didn't seem to know what they were doing. Another doesn't think it's as much of a risk to people with Asthma since she hasn't had symptoms, even though she's an Asthma sufferer. Many of the protesters in MKE didn't wear masks, either. Hard to believe many Conservatives were in those crowds.
I don't think #4 makes sense- care to elaborate?
Let me make up some numbers to demonstrate my intent.
Roughly 30% of the population in my area
wear masks when going into a store (unless the store requires them).
Now consider the composition of the 70% that do not.
If they are all Democrats, we might expect 20% to be influenced by the president declaring wearing masks is the patriotic thing to do. So we end up with 44% of the population wearing masks, which is better, but not great.
If they are all republicans, we might presume 70% conversion to masks which results in 79% of the population wearing masks.
If they are Trump's base, we might expect 96% to convert which results in 98% of the population wearing masks!
So, thus, I hope it is Trump's base that has not been wearing masks, because I believe that results in the safest outcome in response to Trump's endorsement of wearing masks.