The difference between Trump and Biden's cognitive ability and misspoke words , is that Trump is the same as he was 45 years or so ago when he first came on the scene. He has always talked off the cuff, said things for effect to get a rise from his opponents, thinking out loud and messing up names. But he dosent have cognitive damage or neurological issues. Biden on the other hand is ill, he has some form of dementia or as some claim Parkinson's and it's getting worse. There are times when he is well rested or in familer situation when he is reading from a teleprompter and the situation is well scripted that he appears normal, but outside that controlled environment he can be in trouble and appear like he was at the debate. You can not have a President who should be in a nursing home as Biden should be for his own well being.
The Americans have a terrible choice to make in November, it's mind boggling that in a nation of 300 million plus that this is the best America can offer. Biden should have made it clear he was going to be a one term President and the Democrats could have had a open primary where a competent nominee was chosen and somebody other than Trump should have won the Republican primaries. But that didn't happen and unless Biden is forced to drop out, it's going to be a straight choice between Trump and Biden.
I know practically all you believe Trump is the devil, but it's better to have the devil you know than the devil you don't. We have no idea which Biden will be there in a crisis and who will actually be running things and America nor the rest of the free world can not take that chance.