If the poles ice would melt, would it be critical for human survival to try to bring it back?
If humanity will cause natural dissolution of all ice in planet earth's poles and the sea level would indeed rise tremendously all over the world --- would it be justified to try to "reverse" the situation of the poles? Would this be critical, or rather in general, would humans be able to thrive on earth and to even do climate engineering just without icing back the poles?
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There are two parts to your question.
Humans can certainly continue to thrive on earth whether sea level rises or not. We live in quite a variety of climates now. Some climates shifting more towards the poles wouldn't change that. In fact, polar areas are sparsely populated. The polar areas that don't get flooded would likely be more hospitable to humans. There will be less overall land to live on, but there is little reason humans can't continue to thrive on what will be left.
Whether deliberately trying to re-freeze the poles is "justified" is a political argument, and off topic here. There is no science to speculate on. Those that live near the coast that lost land, and those that live in polar areas now made more hospitable will probably have different views on how "justified" changing the global climate is.
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