Apparently, when the US has been in disorder and civil unrest in the past, the Republicans get an extra 6-8 points in the voting percentages
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These are probably the worst riots and social unrest the US has ever had. With Corona19 in decline, this is now the top issue in the US.
America can have who they want to govern them, although, for world politics and power balance, it would better that Biden wins. If Trump gets a second term he will ensure tax is higher for the middle class, and tax is lower for the richest 2%. More trade wars with international countries and deteriorating relations with the Western power block.
Black Lifes Matter is achieving nothing except making the mainstream more conservative. Trump's second term will crush them if they continue. It does raise the question of why the Democratic leaders have not stamped it out. Not just for political reasons, but for safety and public order.