[Hallucinaut]

Isn't the vaccine derived polio simply because it's the cheap version? If that's correct then the direct answer to your somewhat rhetorical question is: subsidise the expensive version globally so that we don't have to later pay for the externalities caused by a riskier vaccine?

[Vecr]

You can't eradicate polio (the virus, not the disease) by doing that though, IPV (Inactivated Polio Vaccine), even the enhanced version, can't produce gut immunity to the level required to stop transmission even with a 100% vaccination rate.