Why doesn't Biden go 100% on the electoral blackmail?

The people of the United States of Gotham anxiously watched their TVs, the loud shriek of the emergency address system made them rapt in attention, unsure of what was taking place. The president was sitting in the oval office, like he had in many other prepared addresses, but this time was different. His face was smudged with unsettling white makeup, and his name placard had been hastily defaced with red graffito to read "Joe-ker".

"People of Gotham," The changed president began, "I have had the DOE fabricate 900 Neutron bombs, and scattered them in populated areas throughout the country. They are linked together by satellite, and if one loses signal or is otherwise disturbed, it will send signals to all of them to detonate. They will also detonate regardless of any action in 131 days, unless the disarm code, which only I know, is provided. there is also a duress code, which if entered, will immediately cause them to detonate. Don't even try to torture me, Jack; you can't know if the code I provide will be the actual disarm code."

What choice did the people have? some still refused to be blackmailed and stayed home. some stood strong and voted for Trump, who had begun wearing a Bane mask and making threats of his own, though all knew were impotent. But enough people were cowed, looking out for their families and loved ones, they dutifully went to ballot boxes and elected Biden in a landslide. on the night of November 8th, The house speaker meets with him privately, begging him to put his code in now that he's won. As his physician swaps out the IV bag of advanced dementia medication, Biden turns to Rep. Johnson and asks "What bombs?"