It's not surprising that America is tearing itself apart if politicians at the top are behaving as described below.

The White House appears to be trying to sabotage the Biden administration not only by keeping the Biden team from information it needs, but by tying its hands and slowing it down. The day after the election, the Trump administration proposed a new rule requiring the new Department of Health and Human Services appointees to review most of the department’s regulations by 2023. It would automatically kill any that haven’t been reviewed by then. This would mean that, just as the new administration is trying to fight the coronavirus, it would be slammed with administrative paperwork. The department’s chief of staff denies the unusual move is political, saying that a review is necessary because one hasn’t been done for 40 years.
Now that the transition process has finally started, Trump loyalists are blocking meetings, or sitting in on them to monitor what is being said, especially at the Environmental Protection Agency. At Voice of America, Trump’s appointed head, Michael Pack, has refused to give meetings or records to Biden’s team. For their part, Biden’s transition folks are avoiding fights in order to get whatever information they can.
Republican senators are also signaling that they intend to delay confirmations on Biden’s nominees, although in the past 95% of Cabinet nominees have had hearings before an inauguration, and 84% of those were approved within three days. Senator John Cornyn (R-TX), for example, questioned the experience of Biden’s nominee for Secretary of Health and Human Services, Xavier Becerra. Becerra is the Attorney General of California, and he sat on the House Committee on Ways and Means, which oversees health issues, during his 24 years in Congress. “I don’t know what his Health and Human Services credentials are,” Cornyn told The Hill. It’s not like [Trump’s HHS Secretary] Alex Azar, who worked for pharma and had a health care background.” - Heather Cox Richardson, a political historian