What about Hitler?
No person is beyond the worthiness of compassion. I was eventually born because a Polish soldier fell in love with a Dutch girl whose town he helped liberate during WWII. Therefore, I have Hitler's ****-starting to thank for my existence, and thus I have to respect his life - regardless of how disgusting parts of it might have been.
So it always goes with history and people - evil is never without good, and you never know just how your life may have been positively affected by something you'd find repulsive and wrong. Everyone's life, and death, deserves respect, because they undoubtedly caused good to happen in some way.
Personally, I hated Falwell's views and pretty much everything he did on the public stage. But his anger was driven by a belief in the evil of the world, and people who take joy in another's death do nothing but prove him just a little right and encourage more to be like him. Not to mention, schadenfreude is just ugly.
This message brought to you by Maniax being a little too stoned for his own good.