Calling democrats "Blue MAGA", at least currently is a stretch and a half since there is still a sizeable difference between the parties, but yeah - current democrats are getting real close to pre-2000's republicans in everything except few policies.
As you have correctly pointed out, a lot of the American liberals are unquestionably supporting Kamala no matter what she does, and it's just so frustrating to see. People can support and vote for a party but also be critical of it much like how you can have your favorite video game and have gripes with it that you hope could have been fixed, but I guess that's taking a backseat in favour of "politics as team sports" where the only thing that matters is beating the other side.
That being said, choosing not to vote for dems because of this is stupid - even if democrats aren't going to shift back to center, it's a much better alternative for the average person (foreign or otherwise) than Trump becoming the dictator. Though I worry about the future of US politics - republicans who stay with Trump are numerous, and once he's gone then another alt-right populist is going to come, one who's even worse than Trump (while being younger and more lucid), and there is no guarantee democrats are going to have Kamala 2 to steal the momentum back or even be able to fight them.
Yeah, this is an absolute shame. He tried doing something similar shortly after the genocide had started, but everyone else currently in power just shut him down almost unanimously.
If politics and getting into power wasn't 90% based on your wealth and connections, maybe US could have more people like Bernie trying to actually do good rather than trying to enrich or empower themselves.