This is a tough issue...
First of all, FSP-Rebel:
Cops may follow orders as part of their job (many people do), but they'll also likely take a bullet to protect you. Not that law enforcement is perfect, but in essence law enforcers are just that... enforcers. They don't make the laws, and 'they' didn't legalize these checkpoints. Much like we can blame Bush's administrative excessive on a pathetically timid congress, we can really only blame a cop's perceived excesses (the legal ones at least) on the laws. So, I guess, watch it before you condemn people whose sole purpose is to enforce the laws and risk their lives to do so.
Second, more of a question:
DUIs cause tens thousands of deaths each year. I'm curious if people have other ideas about how to keep roads safe (roads being a public resource can benefit from some regulation). Would you prefer a privately produced but certified in-car breathalizer system that won't start if you BAC is above a certain level? Seriously...