What to do about snitches?

Rats, informers, narcs, and all the other kinds of traitors are the lowest form of low-life there is. Reading the justifications of assorted goofy anarcho-whatevers, conservatarians, libertarians, NAPsters, and the rest of their ilk for not just blowing her head off is kind of interesting even though it's not persuasive. And they sure do have their work cut out for them here.