If someone believes that political values should be judged with the community and society in mind, that doesn't mean he has to assent to every governmental policy that is then justified by the public good. Things like forced eugenics, genocide, the Iraq war, and the War on Drugs do not simply follow from emphasizing community interests.
So in nazi germany the jews had a choice on wether to participate in the genocide or not? Is that what you are saying?
And yes those things came about BECAUSE we were told it was for the greater good. "If we dont attack Iraq Saddam will get america. Are you un-american?" (aka are you not part of the collective group think?)
And worrying about the public good doesn't entail ignoring individual rights and liberties--especially since it can be argued that they are a public good too.
Yes it does, the definition of freedom is "the power or right to act, speak, or think as one wants without hindrance or restrain." If you tell me that I have to sacrifice my privacy because terrorists are going to get you then yes, you are in fact saying the greater good of the public is more important than individual rights.
We could have police search everyones house once a week and we would probably be really safe because of it. But are you willing to give up that right to privacy for security? If not then why not? After all it's for the greater good.
It all comes down to this, "Does the end justify the means."