This idea is not original to me.
How many dead people is freedom worth? Thousands of people have already given their lives for it. How many is too many? To be more specific, if we knew ahead of time that we could save 10 million lives by giving up our freedom of speech, would you choose to do so?
What about freedom of assembly, freedom of religion, freedom from unlawful search and seizure, freedom from cruel and unusual punishment, and so on?
This sounds very abstract, but it becomes less so when we consider laws designed to protect us. For example, the US Supreme Court has ruled that police checkpoints (where the police stop every motorist in search of drunken drivers, or illegal immigrants, or something like that) do violate the 4th Amerndment to the Constitution, but are OK anyway when they're in the public interest. I don't know how many deaths have been prevented by sobriety checkpoints, but it's probably been at least 10. Is that enough?
Periodically we hear (usually in the context of some new safety law) the phrase "If it saves even one life it will be worth it." I'm skeptical. Everybody dies, and postponing death for one person by a few years, even by a few decades, does not have infinite value.
In 2008 the US Congress passed the Consumer Product Safety Improvement Act (CPSIA). Intended to remove sources of lead from the mouths of young children, its side effects include driving out of business
"tens of thousands" of companies, including thrift stores. I consider myself part of the anti-lead-in-babies camp, but that is a little drastic, especially in these difficult economic times. Nobody even knows if CPSIA will save any lives at all (it was passed in a fit of hysteria over Chinese imports, with very little scientific justification), but only one Congressman out of all of them voted against it.
What I conclude from all this is that people don't actually value freedom very much at all.