This appreciation of Pruitt's nomination to the EPA because it makes "liberals squeal" shows that it is no longer about politics, it's about revenge. Where does the need for revenge come from?
The need for revenge comes from a sense of injury (physical or psychological) caused by some group or person.  As much as one side thinks liberals have caused harm, the other side thinks conservatives have caused harm. And lest anyone agree but think it's worse for their side than the other, this is the disproportionate rule: Though the other side has also suffered, my side suffered worse. 
I heard an Iraqi discussing the cycle of revenge his country was facing. When questioned about his side engaging in murder, he said, "Yes, we have done such things. But the other side has done 10 times more". 
Revenge feels good but usually enrages the perpetrators. It just continues the cycle. As a supposed Chinese saying goes, "before engaging in revenge, dig two graves."