For people who like to think before exterminating anything and looking at the larger picture, they're disturbingly patronising and willing to discount the Valens as "not human." In that sense, they're just as shortsighted and blinkered as the Valens are.

The sharers are almost willfully bad about sharing knowledge of whitetrance and their philosophy -- information that if they'd shared up front, would have saved thousands of lives. It's hard to read a book where you're supposed to identify with people who claim to protect life and share empathy, and are so thoughtless that they don't even explain how the breathmicrobes will affect visitors.