The only thing correct in your statement is "Trump wins reelection in 2020, riots break out in LA, ST LOUIS, CHICAGO, and ATLANTA, Democrats claimed the election was stolen. The Supreme Court ruled that there was no evidence to overturn the results, and the left went crazy.
That's when it became dangerous to go out in public."

[Edit]

Antifa members in 3 person teams spread out across the country to attack perceived Trump Supporters in every city using hit and run tactics. The typical attack would be from behind with a knife attack to the lower back before running away. The police are powerless to stop the attacks and people no longer venture out unless armed and in groups of 3 or more.