Governments don't care about taxes. They care about staying in power either because they're power hungry, or because re-election is affirmation. Either way, it's easier to stay in power if the people keeping you there don't blame you for killing their grandma.
The misanthropic view is that death and misery lead to revolution. The fairy tale view is that governments represent the peoples' will to stay healthy. Either way, it's not about taxes.
There are a lot of very effective vaccines. Influenza mutates rapidly, making it a moving target for a vaccine, but even accounting for that the vaccine helps keep the spread and impact of the flu in check. It also contributes to residual immunity for future strains. This is a lot of the reason for the difference in impact between the 1918 flu and current seasonal flus.
There is no residual immunity or even a weakly effective vaccine to slow the current coronavirus, which is why it's tearing through us like a brush fire.
The HPV vaccine targets strains of HPV that cause most cancers. You don't get a vaccine just to prevent warts.
Who's the last person you know who's had polio or the measles?
I'm pretty sure
@fairuz specifically said they weren't holding out for a vaccine, though. Even given all the current candidates, it's my understanding that there are currently no human vaccines for any coronavirus. The goals here are to keep the infection rate manageable by the health care system, and to buy time for improving treatment strategies. Slowing things down and buying time improves the chances of a vaccine, but no heath department policy is predicated on success of a vaccine.