I regards to the election scenarios...
If Biden is elected I believe that we will continue to see low grade rioting/looting continue in cities and flare up every time a new "excuse" (police shooting) occurs. We will probably see a reduction of ANTIFA versus right-wing militia fighting because Biden is likely to have his feds target the right-wing groups who confront the ANTIFA/BLM protestors. However the rioting/looting in cities will continue under Biden for a significant period of time while the protestors recognize there are limited consequences. After a couple years of riots it will reach the point politically where Biden will need to send in the fed and national guard across many cities if he wants any chance of being re-elected.
If Trump is elected we are likely to see a flare up in the violence as more ANTIFA versus right-wing militia confrontations break out. However Trump will have an "law & order" mandate from being re-elected and take steps to send in federal support to eliminate the rioting & conflicts. Of course, targeting ANTIFA more than the right-wing militias. In summary IMO the election of Trump will flare up worse violence but it will last a shorter period of time.
Of course -- all of the above is just projection. I may totally be wrong. It is hard to predict these type of things in an environment where it just takes a cop somewhere having a bad day to suddenly cause a national outbreak of violence.
In regards to suburbanites being more vulnerable than they realize... I agree that in most U.S. suburbs especially in states where households have limited gun ownership and depend on police protection -- there is significant vulnerability. But the situation varies greatly across the U.S. In North Carolina where many suburbs have over a 50% gun ownership rate and 20% former military as residents -- the situation is tilted in favor of the suburbanites.
I don't think you're factoring in the respect factor. Biden wins and Obama/Michelle will speak. The protesters will respect all three; and also respect the fact that some 2016 Trump supports did the right thing.
They will give Biden/Dems a reasonable chance to do the right thing.
Hardcore rioters will fall back without having the cover of legitimate protesters.
A Trump win will result in an "awww fuck it" response--all hell will break loose at the next provocation.
The vulnerability of the suburbs is regardless to the number of guns owners/neighbors have for several reasons. But like I said, not really wanting to get into that discussion. Even so, there'll be no real winners or losers if it comes to that. America loses.
I agree, none of use can predict this.