Except for MTG, why is the GOP going along with the "coverup" narrative?

The great MTG is virtually the only member of Congress who has asked point-blank if the assassination attempt was INTENTIONAL. It has not yet been proven it was, but neither has it been proven it wasn’t!

So why does the GOP play into the hands of the cover-up underway by only using words like “mistakes,” “incompetence,” “errors” etc.?