We do live in the 21st century. We have access to new and improving technology, it's time to invest in those instead of falling back into options that are archaic and don't serve the current circumstances (i.e. the manual digging of wells). Wells serve as a good stop gap measure to provide water while other infrastructure is built, but they shouldn't be the goal.
That's just to start with. Even if vaccines were 100% effective on 100% of people given them (which we know they're not, even you can't say they work all of the time) that still only protects the immediate population. Infrastructure provides for the immediate as well as future populations - a much better way of spending.
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