That is a million dollar question and one that should have been answered waaaaaaay earlier. I wanted a competitive primary process where we had Harris, Mayor Pete, Newsome, Warnock, Whitmer, etc. all competing for the nomination. Folks were either too cowardly, too disinterested, or pushed to the side by Biden's campaign team and folks within the party. I agree with you in principal that this is a dangerous time and place to have this argument. I agree that we are playing with fire doing it now instead of a year ago. I agree that if Biden is the nominee we need to then do everything in our almighty power we can to get him elected.
What I don't agree on though is that he is the right person to articulate and prosecute the case against Donald Trump and serve as President for the next 4 years. I'd prefer Harris as our nominee to better articulate and make that case. As well, to be able to be President for the next 4 years. If it is Biden though and he's staying in, then so be it. I'll be out there doing what I must to get him re-elected.