RebE, a good example. To extrapolate, when there is nobody else to do a mitzva, you should try to compensate.
three is a more explicit one:
Pirkei Avot 2:5. In a place where there are no men, strive to be a man
Berakhot 63a bar Kappara taught: If the price of the merchandise has declined, jump and purchase from it; and where there is no man, there be a man; where there is no one to fill a particular role, accept that role upon yourself.
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