It's the fault of everyone who didn't vote against fascism. That's how it works; if you are capable of voting for Kamala, but didn't, it's your fault Trump won.
Kamala was the vote in favor of Palestinians, workers, and domestic minorities. If you didn't spend about an hour to vote for her, that means you think all of those groups aren't worth an hour of your time or you're too stupid to figure shit out.