Embracing the left-liberal framing of this issue, right down to using slogans like the big lie isn’t called speaking truth. Kitzinger and Cheney are part of a partisan committee that exists only for the Democrats political benefit that at this point has little to do with January 6th anymore (Less than 10% (!)of the subpoenas sent out by the commission were to people who were actually involved with January 6th) They have done whatever they can to look for fights with other Republicans and are being responded to in kind
One can dislike Trump and at the same time realize that Cheney and Kitzinger and many other opponents of his aren’t good people who are acting out of altruistic motivations or standing up for truth.