Great and valid points.
But IMO, there is another piece to the equation: Many on the left are guilty of serious crimes (bribery, corruption, pedophilia, murder, treason, fraud, embezzlement, ... ) and they are terrified that the Trump administration won’t protect them and continue to cover up those crimes.
Often when their behavior doesn’t seem to make sense, if you stop to look at it with the assumption that they are guilty of serious crimes and are afraid of being found out and held to account, the behavior suddenly does make sense.
There's no doubt you are correct.
They were so darn certain that Clinton would be elected and continue the leftist reign of corruption that they just threw all caution to the wind.
Look how brazen they became with their lying, cheating and law breaking during the campaign and how that conduct has continued in their attacks against president Trump.