[Grishnakh]

If you don't make it compulsory, then it doesn't work. Vaccination relies on herd immunity because the vaccination doesn't work for everyone; some people can't have the vaccine (allergic to one of its components), for other people it just doesn't take effect (biological systems are unreliable like that), so you have to have an over 90% vaccination rate for herd immunity to actually work. By allowing people to opt out, you're condemning a bunch of people to illness and death.

Lemme guess, you're a libertarian, right?

[Grue3]

So you're arguing that flu vaccine must be mandatory? All the other vaccines (there sure are plenty)? You're just plain wrong about vaccination relying on herd immunity. Vaccine is still effective for those who take it. And the oft-repeated number "90%" has no scientific basis whatsoever, the herd immunity threshold is heavily dependent on how infectious the disease is, and plenty of other factors.

[Grishnakh]

No, you're just plain wrong. Go read any of the scientific literature about it. And yes, it does have a scientific basis, that's why REAL SCIENTISTS talk about herd immunity. The vaccines are NOT effective for everyone who takes them, that's why herd immunity is necessary.