If the dem party kept saying they were pro-choice but then started filling seats with mostly pro-life judges, they would lose voters. Some things are a bridge too far for people. Republican voters don’t think spending is an important enough issue to put their foot down and say enough is enough.
When a political party frightens the public about deficit spending and unsustainable debt while that party is out of power, and then when the party is in power they cut taxes for the wealthy while increasing spending, it's easy to infer that their claims of fiscal responsibility were just a ruse to gain power.