"Again, no one is saying we "stop everything else until we get there.""

It sounds a bit like it. Because also the main problem with this thought is, it requires a different distribution mechanism. Socialism for example. And or managed economy. Because today food gets produced the capitalistic way. To make money. Not a charity. Poor people don't have money.

So if there is a charity to buy enough food and able to distribute it to everone ... ok. But many tried, and you could argue it disrupted local food economy (charities bringing in free food, nobody bought from the local farmers anymore, they went out of buisness, simplified but happened)... and therefore increased the need for food delivery etc.

Also, as cruel as it is, the less hungry people, the more people who need food.

In other words, the problem is complex and not simpel. So those who feel the need to solve it (I do a bit actually) should do it. But others who want to explore the mars .. should do that.

Both is important. But maybe mars is actually simpler, than sustainable solving world hunger. Btw. people also like electricity, houses, cars, education ...