Reason knows not why
Pity poor Russell Nigro. The Legislature votes itself and the state judiciary an obscene pay raise in the dead of night, and voters decide to take out their rage on Nigro, who claims innocence. Nigro calls the voters "irrational" for doing this, but it's actually quite rational. Legislators weren't on the ballot this year, so voters used Nigro to send lawmakers a message. Think of it like a bank robber in a movie, killing a hostage to let the cops know he means business.
Now, you want to know what's really irrational? It's voters in the city of Pittsburgh who continue to blindly elect Democrats, even though one-party rule has taken this city to the brink of bankruptcy. And it's a Republican Party that can't be bothered to invest time or money to nominate serious candidates in Pennsylvania's second-largest city.