Well... Short answer talking about "the left" and "the right" is effectively doing something called "constructing a public". These are are not just political constructs, they are political constructs that do certain things. Neither of these constructs have hard boundaries and throughout time they shift.

But there is a distinct difference. When you look at the right, while the presentation changes they have a fairly straightforward citable group of guiding philosophy traceable through a small handful of writing. If you read Thomas Malthus and Edmond Burke they will sound like slightly more archaic versions of modern pundits on the right. When you listen to the modern pundits you will notice that they are very repetitive and what differentiates one from another is more or less just presentation style. That repetition of talking points changes it's arguements but never it's foundation. Since it's mostly in service of protecting a status quo where hereditary privilege is upheld it doesn't have to get complicated. It just has to justify the world as it has been and that humans are sneaky, fundamentally flawed and morally defunct but that by structuring society as a winnowing process where playing the game the rightful and just few will rise to the top.

But when you look at "the left" it's not an easy gradient, it's a loose scattering of little clusters of very different ideologies and guiding philosophies. Since it largely works of a guiding concept of dissolution of established aggregated personal fortunes and radical anti-supremacist framework of various forms it's not uniform. There's anti-colonialism, anti-racism, anti-monopolist, anti-capitalist, anti-discriminatory, pro-neurodiversity, expanded personal rights, pro public service, pro democratic and anti democratic groups, pro freedom of movement, anarchists, and acedemic political theorists each with individual theories about how to bring about a state of all these things when none of this has in living memory existed. It's not generally trying to defend a status quo but trying to feild test different ways of doing things... So basically everybody and their dog has a slightly different opinion of what is a good idea.

It's kind of hard to see " bad faith actors" as it were because any two leftists might have almost no ideological overlap as far as praxis. They might not see each other as being part of the same tribe even if outsiders looking in would classify them as "left" and they might all claim to be "left" themselves... It's not that it's contradictory, it's that the branching paths of divergent evolving philosophies have rambled off in a whole bunch of different directions and effectively become whole other creatures entirely.

Because “the left” is a set of principles not a group of people?