Why isn't Trump's mishandling of classified material the straw that breaks the elephants back?

For years I heard people say that there is nothing Donald J. Trump could do that would cause him to lose support from his base. But I always thought - no there must be something and I figured his mishandling of secret documents would be it but so far it doesn't seem to be the case. 

Trump's former press secretary has said that while Trump was in the WH he demonstrated an unnerving carelessness with national security information. It happened so many times that I was able to put together a Top 10 examples of the phenomenon:

#10. In May 2017, Trump had a chat with Philippine President Rodrigo Duterte in which the Republican shared information about dispatching two nuclear submarines off the coast of the Korean peninsula. By one account, Pentagon officials were “in shock“ over Trump’s willingness to share such information. “We never talk about subs!” three officials told BuzzFeed News, referring to the military’s belief that keeping submarines’ movements secret is key to their mission.

#9. In September 2019, during a photo-op at an event along the U.S./Mexico border, the president seemed eager to boast to reporters about detailed technological advancements in border security. It fell to Lt. Gen. Todd Semonite, the acting head of the Army Corps, to interject, “Sir, there could be some merit in not discussing that.”

#8. In July 2019, Trump had an unsecured conversation with U.S. Ambassador to the E.U. Gordon Sondland, while the ambassador was in a Ukrainian restaurant within earshot of others, in which Trump sought information on Ukraine helping target the president’s domestic political opponents. Larry Pfeiffer, a former senior director of the White House Situation Room and a former chief of staff to the CIA director, said of the call, “The security ramifications are insane.”

#7. In February 2018, Trump ignored the pleas of many U.S. officials and recklessly declassified information from the so-called “Nunes Memo” in the hopes of advancing a partisan scheme.

#6. In February 2017, Trump discussed sensitive details about North Korea’s ballistic missile tests with the prime minister of Japan at a Mar-a-Lago dining area, in view of wealthy civilians/customers.

#5. In early October 2019, Trump publicly discussed American nuclear weapons in Turkey, something U.S. officials have traditionally avoided disclosing and/or confirming.

#4. In August 2019, Trump published a tweet about a failed Iranian launch, which included a detailed photo. As MSNBC’s Andrea Mitchell reported, it wasn’t long before experts marveled at Trump’s recklessness with classified material.

#3. In October 2019, Trump needlessly blurted out all kinds of tactical and operational details about the al-Baghdadi mission in Syria. As NBC News reported at the time, “A few of those colorful details were wrong. Many of the rest were either highly classified or tactically sensitive, and their disclosure by the president made intelligence and military officials cringe, according to current and former U.S. officials.”

#2. In 2020, Trump disclosed the existence of a secret nuclear weapons program to Bob Woodward, to the surprise of national security insiders.

#1. Just four months into Trump’s presidency, he welcomed Russian Foreign Minister Sergei Lavrov and Russian Ambassador to the U.S. Sergei Kislyak into the Oval Office — at the request of Russian President Vladimir Putin — for a visit that was never fully explained.