Why Haven't Any Living Former Presidents Publicly Supported Trump for Enforcing Their Unanimous Red Line?

This is a fair question from Matt Continetti, who recites some of the relevant quotations before posing it - Guy Benson 

• I'll add to the list. President Bill Clinton described a nuclearlzed Iran as intolerable and signed the Iran Nonproliferation Act of 2000, "which authorize[d] him to take punitive action against individuals or organizations known to be providing material aid to weapons of mass destruction (WMD) programs in Iran." 
• President George W. Bush intoned in 2008 that "permitting the world’s leading sponsor of terror to possess the world’s deadliest weapon would be an unforgivable betrayal of future generations." He added, "for the sake of peace, the world must not allow Iran to have a nuclear weapon.” 
• The Atlantic's Jeffrey Goldberg cooed about President Barack Obama's "crystal clear promise to stop Iran from getting a nuclear weapon." Obama himself said in 2012 that "when the United States says it is unacceptable for Iran to have a nuclear weapon, we mean what we say." 
• For added emphasis, he said, "I don't bluff." President Joe Biden declared that the Iranian regime would “never get a nuclear weapon on my watch” in 2021.