Fact # 1: It would be normal for the midterm, for the GOP to lose some ground
Fact #2: Since 2008 and Obama's arrival and impact, the dems have lost a vast amount of political power, Federal and statelegislatures, governorships,, etc.
Trump regained the Presidency plus added twice to the Supreme Court and lower federal courts.
If violence in the streets is the best answer the new leftists have, I doubt the US will fall to violent internal terrorism.