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One is oriented more short-term (polio), whereas the other is more long-term (not putting all our eggs in one basket).

Both are good.

Well, "good" depends for who. The beneficiaries would be first-world population in one, and third world in the other.

Besides, putting all eggs in a basket could be a fitting metaphor, except if the person holding the basket has a perverse passion for stomping on it.

Moving to Mars wouldn't be a way to save the population, it would be an excuse to find another planet to destroy.

There really is nothing to destroy on mars. You can't destroy an ecosystem where there is none.

Stomping out polio is not short-term.

What with the anti-vaccination idiots, stomping out lots of things that should be simple is proving difficult.

We are really friggin close to eradicating polio!

The Americas (North and South) have been polio free since 1994. The last 1% is what has proven to be difficult.