Or maybe those who don't have skin in the F35 game can see how compromised the aircraft is and wish to protect the ability of (the) nation(s) defence to be somewhat effective.
One would argue that those who stand to gain from the "success" (aka continued production whether or not the product is effective for the purpose of defence) of the F35 program have done a rather good job of almost ensuring that it is not possible to cancel the program thus protecting their investment and subsequent return (from the taxpayer.)
Exposing the inadequacies of this product when so much of the taxpayers funds have been expended on it and more importantly it is clear that even more is required to eventually produce an effective tool may actually be in the best interests of the nation.