They put Biden up there in his current condition because they have now decided to get rid of him. His deteriorating mental and physical health has become a liability. They send out the word and all of a sudden the entire media plays along and turns on him. These are clearly not independent media voices. They have known about Biden's condition since 2016 and have done everything possible to keep it from the public. Look how many people seemed (or pretended to be) surprised by Biden's condition on stage. That would be impossible if an independent media had ever any access to him.
They simultaneously spread the "Trump's a Liar!" mind virus, hoping to use Trump's tendency to speak hyperbolically to confuse the public. I counted exactly one Trump lie - when he said Biden had described Blacks as "super-predators." It was actually Hillary Clinton who said that. So don't expect any serious fact-checking to be done on that one.
I recommend that people who are still undecided find independent media sources to follow and form your own opinions. Don't do your research on social media, by watching late-night comedy shows, or reading unsourced, off-topic posts on entertainment sites.
Do your best to avoid the government-media complex's many tentacles and uncover the truth for yourself. These people have gotten very good at provoking emotional responses with online language. A lot of your future earnings are at stake - and they want their allies to get them.
When you hear an entire national media machine repeating the exact same slogans at the exact same time, word for word, as you did in the wake of the debate, you may know you are being lied to.