Well first, you don't seem to understand how herd immunity works. That 70% you quote is only a useful number when there isn't an active epidemic. With an active

Well first, you don't seem to understand how herd immunity works. That 70% you quote is only a useful number when there isn't an active epidemic. With an active epidemic you get significant overshoot. If we dropped all mitigation efforts, you should expect this to infect something like 95+% of people before effectively dying out. The amount of overshoot is going to depend on how widespread the infection is. Second, you can develop immunity without the bad effects of actually getting the disease (ya know, like a fucking vaccine). Saying that we need xx% of people to develop immunity doesn't mean that we need xx% of people to get this deadly disease.