They want Trump supporters to come out and challenge the protesters because they know violence will break out. This is not a joke and not overreacting. Things could get very ugly, very quickly across the entire country if fights start breaking out.
EDIT: We are not safe until Trump is actually in the White House. Do not get complacent. Small fires can spread very quickly under the right conditions. Be prepared. Powerful elite do not go down easily. We haven’t won until Trump is in the oval office and there is a lot they can do to stop that between now and inauguration day.
Mass civil unrest = Martial Law = President suspending transfer of power due to “National Emergency”. This is the plan.