People aren't acting like that. You just refuse to look at anything objectively or with nuance.
While there is some truth to what you are saying, you can just look at D's vs R's with Biden and Trump.
Biden looked senile on national TV in his debate and he got booted off the ticket. Trump sounded senile and said all sorts of crazy shit in the Kamala debate and it barely moved the needle.
You're really telling me that there is no difference between D's and R's with unwaivering support from their bases?
...and that's just one concrete example
You think he got booted off the ticket by his voting base? Nah, he got booted off by other dems in power because he couldn't win. Not because his base budged, but because independents werent gonna vote for him. How many people do you know that were in the tank for Biden, voted for him in 2020, were gonna vote from in 2024, constantly argued that he was "sharp as a tack" and then the debate happened and they said "Oh, geez. I guess I can't vote for that guy now"? How many people on this forum like Jack Savage or any other die hard dem was absolutely gonna vote for Biden, and then changed their tune after the debate? Can you name one? The answer is probably literally zero.
Yeah, Trump said crazy shit. But thats Trump. He didnt do anything new, he's always been hysterical. People know what they get with him. Biden was a different situation because the whole story was how competent he was and all the criticisms about his capability was just right wing rhetoric. Then the first half of the debate he just fumbles around and loses to a guy that literally no one should lose a debate to (although to be fair, the second half was much better for him and Trump was gassing hard).
Being a staunch base voter isn't
necessarily a bad thing. Some people just prefer right or left wing policies. So these people are willing to deal with almost any amount of bullshit because they'd rather have 4 years of policy they prefer. If people just voted on who was a better person, Kamala would probably win in a landslide, but that's not what most people vote on. If someone genuinely prefers, or even all out supports a party 100% down the line it would practically take a child molestation charge to budge them...and even then.....it's a maybe.
I definitely lean right, and would prefer 4 years of Trump policy over 4 years of Kamala policy, and a lot of people think the opposite and that's fine. But I can't vote for any of these people. To be fair, since I live in California I do get the escape hatch of "No R candidate is gonna win". What I'd prefer, and I realize it's pie in the sky, is for everybody to just say "Fuck this noise" and not vote for either of the two parties until they can put up a reasonable candidate. Like I said, I know that's a fantasy.
But anyway, I don't think bases ever really budge. It isn't necessarily because they're "stupid" or biased (although theres definitely some of that, but I'd substitute ignorance for stupidity in most cases). Its just because they have policies they prefer and think 4 years of policies in their preferred direction are worth whatever bullshit they have to put up with from the candidate. It's why it seems like 99% of political discussions are never really about policy, but about how much "worse" the other person is. Ultimately nobody can take Trumps ideas and sell it to someone who wants leftist policies, and then the opposite is true that nobody can take anything Harris would do and make somebody who wants right wing policy say "Yeah, I'll take that instead of the guy who would give me a lot more of what I want". So it almost always just becomes "Look how terrible they are as a person", "look what a threat they are to the world/country/family", "Look how stupid they are".
Oh, well, what are you gonna do?