Sounds like you’ve never socialized with others who have a stutter. Instead of understanding how different mental/physical impairments affect people, you’d rather just make assumptions and baseless claims that confirm your own biases. Biden’s stutter is a well documented ailment that has affected him, in similar ways, for a long time - we just got to see it when he was clearly under the weather.
You can factually disagree with Biden’s policies, but to create this elaborate scenario out of whole cloth and purposely ignore Trump’s own verbal missteps just tells all of us all we need to know about why you commented.
But you are making a choice: you’re choosing to only let observable facts influence your beliefs. Everyone is an atheist by default, and most of them are then told to believe what they’re told from birth, but at some point people make a conscious choice on how information is prioritized. Humans aren’t read-only and I would say it’s a safe bet that most people have the opportunity to influence their own beliefs and act accordingly. Obviously if someone is abused and doesn’t develop mentally, then yeah, don’t hate the person but don’t necessarily give up on helping that person develop, either