That's because the majority of the democrats are also really right. As soon as a more left oriented candidate steps up, like Bernie Sanders, they're called a communist and people run to right oriented big corporate pawns instead.
The end candidates of the 2 parties (which is a dumb system itself) are a product of what the entire party chose to represent them. Maybe the situation this time is a bit different, with Biden stepping down and formally pushing Kamala forward, but Biden is also a product of the democrats. He was chosen to represent them. Biden is also right wing. Mildly compared to Trump, but strongly compared to what the rest of the world considers to be left. The entire states shifted further to the right. And never was left in the first place. I mean, slavery is still legal. Wtf.
The US is shifting further and further towards an autocratic state. Everyone claims it's the land of the free, chooses for leaders who will take away their freedom and then complain they aren't free anymore. Yeah, well, you get what you paid for. It's just fucked up the decisions these people made will fuck up a lot of people their lives. "I want all those other people to suffer, but I didn't think it would also harm me."
Evil version of an evil version... Evilseption. I guess chalange to a competition.