I like to spar with the wingnuts. I go to sites where both my and their points of view are tolerated and I debate, mano a mano.
I've found a strategic point of argument that really works.
I know us liberals are loathe to talk absolutes or engage in what seems to be calling names. But never avoid the truth in that process.
This works because, used correctly, it's absolutely true and there is no defense.
It's simple:
On topics of torture, sexual abuse, obstruction of justice... oh all the big issues...
Make the point that evil only needs an excuse and is always looking for an excuse to exist. Too evil for the laws on our shores? The evil can live in Guantanamo.
Long-time Bush apologists have been finding excuses for evil until they do it reflexively.
Just call them on it at every juncture where they are arguing for it. When you see someone justifying evil...
Finding excuses for evil again?
They get panted with the truth. It sticks. It really does.