A lot.
I know there's a proportion that were simply ignorant and tuned out of politics... but most Trump voters did so over the very loud objections of trans relatives or while openly embracing the nativism.
Lastly, I think that Harris did a terrible job advocating for her election and she owns a fair portion of the blame as well.
Trump wasn't an unknown this time. He attempted to subvert our election process and he's a convicted rapist. He openly embraced corruption during his last term and is already shilling crypto bullshit.
Trump voters are terrible selfish people - end of story.
Sigh. My mom turns eighty soon and I've got to travel to the US soon... but I really fucking wish I didn't have to