A bird needs 2 wings to fly. The left wing and right wing keep trying to fly in different directions and clip the other, increasing it's acceleration as it torpedoes to the ground. Or so the saying goes.
I don't know if it what you meant, but I interpreted that as you implying that both left are right are necessary for society to function, when in reality there is an ethical and an unethical side.
DNC is kinda wide and at the moment they have a bit of progressive values too especially in societal issues like kinda in favour of LGBT, a bit of healthcare and not too much for guns. Not against genocides though. And mostly neoliberal.
Technically, having those value is not what should place them on the left.
The real deal comes with the way they approach domination system. While some could lean on the left, overall, they are friends of capitalism and do not project to counter it or destroy it
(aside from people like Sander who I could eventually call soc dem, a bit like the current PS in France at the moment, even LFI in a way)
left wingers can criticize other left wingers and vice versa.
Of course.
Identity politics - left and right have become identities.
You are not wrong. There is a lot of performative politics. Especially on the left.
People now pressure others to pick sides by flaming emotions and if you aren't on their side then they will see it as "you are against us".
But that's a different matter that has nothing to do with identity politics. Pressuring people to pick a side through emotion is a legitimate political action.
For the left, basically, if you don't take a side when we are showing you oppression, then you take the side of the one who perpetuates it. It's basic ethics.
What people doesn't realize is truth shifts and it goes beyond ideology
Lol no it does not.
For ex: slavery don't start to become ethical because political shift. It can become more or less accepted, but the ethic behind will not change.
This idea that truth is relative which would somehow justify the importance of not taking side or to keep looking at the rethoric of an unethical political side is simply a coping mechanism to justify our own refusal to act in front of oppression or unethical actions.