hates the idea of liberals, and hates the idea of cats even more.
Someone hated, in the abstract, no less, the idea that this liberal had a home with children and a pet, and decided to commit an unspeakable hate crime.
Someone had it in their head to do this, and write "liberal" on the side of that dead cat.
Someone decided that this would be a great way to spend their time, killing and mutilating a defenseless animal.
I don't know who that person is, but I can bet you one thing. They're in a place no one would wish on their worst enemy.