The left is about power. If they take over (presidency, house, senate) they know their tactics of resistance, investigation and riots worked. If the status quo remains (republican presidency, republican senate, democrat house) then they know that they can continue their tactics because they did not pay a cost with the electorate. The only way they will change their tactics is if it costs them big with the electorate (republican president, republican senate margin increases, republican house, as well as republican wins down ballot at the state and local levels). A massive red wave is the only thing that will make a difference and cause the democrats to at least feign moderation and cooperation so as to regain power.
A massive red wave will cause the Democrats to cry about ignorant voters who are selfish because they don’t want the Democrats rioting and stealing their stuff.