Trump has gone off the rails at recent campaign events. If Biden’s difficulties are fair game, why isn’t Trump’s apparent mental decline front and center?
Because we can do something about Biden? Joe is willing to consider what is best for the country, whereas the orange puppet is only interested in what is best for himself (as explained to him by the puppeteers who pull his strings).
I think that's why we can usefully discuss Joe's mental state. I like Biden, but I have no enthusiasm for his candidacy. Surely the Democratic Party has some stronger candidates. And all of the obvious ones are MUCH younger, too.