Several points:
No one is addressing the large number of Republicans, include Bush and Romney, who are voting for Biden. Not to mention all the former Trump staffers (including Bolton) and intelligence officials who feel that Biden is far better for the country than Trump. Please express your feelings about this.
Concerning Obama’s record/legacy: One thing that has been largely ignored is the April 2010 Nuclear Security Summit in which 47 heads of state met in the White House to discuss ways to prevent nuclear materials in their control from falling into terrorist hands. Al Queida and others had been trying their best to get hold of whatever nuclear materials they could through all kinds of seemingly legitimate fronts and proxies, and Obama did everything he could as president to persuade the largest gathering of heads of state in the White House since 1945 to coordinate their efforts in this area. We may never know what he succeeded in preventing (as Paul Krugman once wrote, “One terrorist nuke made from FSU fissionable materials can spoil your whole day.”) but the consequences, if unknown, may we have been extremely significant. I once saw a Palestinian leader quoted, “The day we get a nuclear weapon, that day we use it.” Obama did this in cooperation with the leading Republican experts in the field. It didn’t have much political traction at the time.