I think “They can’t be trusted” is a great hook. It can be connected to large numbers of important failures. Like dealing with climate change. With gun violence. With homelessness. With abortion. With poverty. With children going hungry. With injustice. With gross income inequality.
“They are failing us” can be connected with the same issues.
“They focus on trivia. They are not the right side of the big issues.” I think this can be well demonstrated with numerous examples.