Is your position that no matter what the dems did they could not win the election because of stupid voters? This is where I disagree. There is and will always be uneducated, stupid and biased voters. A smart leader is able to overcome it. Muslim voters felt like they were not being heard, and they wanted to punish the incumbent. That's usually the natural outcome when a demography feels like they are not being heard.
The problem going forward is going to be how dems can relate to people who feel like they are not being heard. Do you accept it as inevitable and blame the "stupid' or do you craft a strategy to overcome it? We lost a few important supporters like Musk and Ackman with a huge following during the last election. These people are not stupid. They just formed an alliance that they thought would benefit them more. Ackman was pleading Biden to drop out for months and then he switched sides. To ignore the mistakes as someone else's problem is the recipe for failure again.