Isn't alot of the gemara, relying on chazal. Trusting Chazzal
Hillel and Shammai have tihs argument, which way to light the chanukiyah. Really subjective really, but the halacha is then concluded to what it is.
The rabbis say that verse/pasuk x teaches y. e.g. a verse that says don't eat from a tree, teaches all the 7 noachide laws. (it's a hint but they talk about it like it's derived, "from this we learn", why is that?).
We certainly seem to have to trust chazal alot.
But rabbi bar hayyim, seems to agree with shabbetai ben dov, in pointing the finger at chazzal, and saying they didn't document the second temple era properly, they spun the story of rabbi akiva's students dying of a plague(contrary to the tradition from the Sherira Gaon, that they died fighting). They didn't want to canonize Maccabees 1 and 2, and the only reason we have them is that monks preserved them. All for their pacifist tendencies, and (perhaps rightly) so the jews would be passive.
The charedim have a concept of emunat chachamim.. I don't know if it has a basis. But even the modern orthodox tend to have it of chazzal. Doesn't a lack of emunah in chazzal pull into question their statements in gemara, and put us on a really slippery slope. It's a very liberal attitude.
How can they even be trusted on halacha.
This calls into question the belief in the wisdom of Chazal, crucial for studying their words.
It's one thing saying they can make mistakes in science, but on fighting and israel, this is in fundemantal ways that a jew should act.
Did any of chazal want to publish Maccabees? Even rabbi akiva(a fighter rabbi!) didn't.
And if we are to be liberal with the 3 oaths aggada, because it's aggadic, then by that reasoning, we could be liberal with all agadah. Not taking it too seriously.
And if you want to say for an aggada, that it was only intended for then, then why was it written/included in the gemara.