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If I were designing a virus to infect the entire world, I'd somehow make sure it was asymptomatic until everyone had it. If I couldn't do that, I'd make it mild or asymptomatic in children, who attend mass gatherings every day and who keep their parents home when visibly sick.
Of course, this strategy relies on public health and other government officials, who are equally able to reason about such strategies, not doing the things they obviously should do, perhaps in a gamble to avoid immediate criticism or protect their careers.
The officials who move quickly and decisively are the real heroes, not only because they protect their own people but because they give cover for the cowards to eventually do the right thing too.
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