For example, unlike the media, Obama avoids saying that violence is partially justified, or claiming that some groups have a higher chance of being killed by police, and instead talks about the "recurrent problem of racial bias in our criminal justice system".
Indeed, people on the center and center right sometimes use the FBI crime stats to argue that there is no racial bias in police killings: since African Americans make up 27% of the arrests while constituting 13% of the population, it is consistent with the fact that they are twice as likely to get killed by police.
Much fewer people, however, would argue that there is no bias in the criminal justice system, given the evidence.
So I am hopeful that by making more moderate arguments, Democrats will be able to squeeze perhaps the extra 1-2% which is all is indeed to defeat Trump.
I agree with you except on the "defeating Trump" part. Moderation is not enough IMO. Everyone with a progressive agenda who is not stongly distancing themselve from the rioters right now will have his cause collaterally defaced by them, just as they collaterally deface these neighbourhoods.
Disclaimer: Not a US-citizen nor resident.