Sometimes, something is a bad idea and you should feel bad.

Since when is it anyone's responsibility, when confronted with stupid, wrongheaded, destructive, or actively evil ideas, to refrain from calling out their proponents, keep mum, and come up with an alternative to sell? You don't have to be capable of brainstorming all-new policy proposals to see  weaknesses in existing ones, just as we don't expect critics in a variety of fields to also be creatives. And regardless of the origin of the bad ideas, challenging bad ideas is always and everywhere to be encouraged. The manner in which one does so may determine whether the proponents continue to socialize with you or not, but there are only so many ways to tell someone gently that s/he is making the world a worse place.