I'm going to respond to the original question here, and ignore a lot of the more recent posts.
We are actively looking at purchasing a doomsday farm, and I have given some thought to the so-called zombies.
The question of what I would do if faced with starving refugees is a difficult one that's made easier if the people are abstract, not real people, begging for some food, possibly with children.
Nobody will be able to take in more than a handful of refugees. That means people will either have to forcefully turn them away, possibly endangering neighbors who may not have the manpower to keep a 24 hour watch, or else take, shall we say, more permanent action.
The choices would be even more heart-rending if children are involved.
The current Sweden thread started with a wikipedia link to a list of famines:
http://en.wikipedia.org/wiki/List_of_famines
It was an eye-opener for me. Even European countries seemed to face a serious famine every century or so, and China and India (probably home to a third of the world population in premodern times as well as today) faced famine situations whenever a harvest was even slightly below average.
That means most people alive in preindustrial times worried about dying of starvation at some time in their lives.
People can't really comprehend that level of suffering. One's choices are pretty much
1) Avoid seeing pictures of starving people or get callous their plight.
2) Try to help a few people either chosen at random, or whoever you happen to hear about that you can help.
3) Become an aid worker and do your best until you realize that each woman you save now will have several kids that starve later.
I guess there are a few other choices, but I think that covers the ones normal people might choose.
There will be massive amounts of suffering until
1) the human race is extinct, or
2) Every single group alive practices birth control. (One of Malthus's observations was that the groups with the highest birthrate tend to dominate, numerically. So if only 5% of the population has a high fertility rate, that group will be 50% or more of the population in a few hundred years.)
Mind you, I do believe we will be in for serious global warming which will bring the population down to somewhere between 10,000 and 100,000,000 people. Plenty of suffering no matter how much birth control we use now. I figure I have an obligation to stay strong for my kids' sakes. Otherwise I probably wouldn't bother trying to survive the dieoff.