Neil,
There are other sources of food.
Food sources that don't come from agriculture? You mean, fast food?
Why not let others farm and steal from them or beg or take X job and buy food?
The point is that farming is necessary to civilization; these other jobs are not. They are built on top of farming -- either by stealing or by begging -- and the farther away from the farm they get, the less likely they have any bearing on reality. At a certain point -- and it's not very far from the farm when you reach this point -- these jobs are nothing more than endless games of make-believe.
What does this have to do with feeding the starving world? The more food they have the more competition for food is against me.
Uhh... no. If the developing world had modern farms, there would be no competition against you. You might as well be saying "the more farms there are in France, the more competition there is for food against me." It's pure lunacy. You would not suffer at all if the developing world was developed.
I think you are just trying to rationalize idleness.
Not at all. All great philosophers were idle. Some, like Bertrand Russel, wrote books praising idleness. Others, like Diogenes and Buddha, lived lives that loudly proclaimed the virtue of idleness. Even great non-philosophic minds like Darwin and Newton required the fact that they were part of the idle rich to perform their experiments.
I am not rationalizing; rather, I am relating a fact. Idleness is necessary to any skill in philosophy.
Since you are both not part of the idle class and not a very good philosopher, you are incapable of judging whether ot not this fact is true.
All you would need to do is farm enough to feed yourself and idle around in blissful religious high for the rest of your life.
Farming in the developing world is not "farming enough to feed [myself]." It is farming for people who need the food in close enough proximity to them that I can be certain they are benefitting from my efforts. It is also going to require several years of preparation to be certain that I have the knowledge to do this.
As Unidian already pointed out, philosophy does not lead to "blissful religious highs". Enlightenment, for instance, is not pleasure.
In the best case scenario, philosophy helps a person tell true from false so they can determine what is the best thing for them to do: usually the best thing is an unavoidable obligation that only someone well-steeled in the fine art of thinking is capable of doing. It is unavoidable because not only can nobody else do it, nobody else wants to do it...
and it has to get done. I highly doubt that Diogenes, for instance, experienced blissful highs while he sat in his barrel his whole life. But he had some very important things to say about hard work (it took a lot of hard work for him to live in a barrel, for instance) that only he -- the hardest working man in all of Greece -- was able to say.