Some Are Useful

I hate campaign season. Everything is fake. It's terrible. Really truly horribly icky. Blah.

My economics professor has a saying that he repeatedly uses:
"All models are flawed; some are useful."

I'd like to extrapolate a bit and apply it to our current situation:

All politicians are flawed (replace with: assholes, morons, or whatever fits your need); some are useful.