But letting it infect 50-60% of the population seems crazy as it would wipe out so many of the old folks
can't really fight it in that case.

It wouldn't be the approach I'd go for but it is not like it hasn't been thought out and they aren't putting other measures in place.
Who knows how effective it will be, I've yet to see an ideal solution yet. I wouldn't be surprised to see a different tactic in a few weeks time.
