Unless of course one subscribes to rather silly and naive notions like that the USA is the primary source of conflict in the world.
By treating agriculture as a free market, without protectionism and subsidies, we'd allow the developing world to actually develop, reducing the frequency of "times of conflict."
As a practical matter, the argument you've given is just a (common enough) red herring. Stopping the United States from trading with its primary trading partners would be somewhat less practical than trying to keep Rome at its peak from importing grain from Egypt.
Your comment seems to indicated that it is less develop countries that are to be feared in times of conflict. This is not the case, with very few exceptions it has been the more developed countries that seek to exploit those regions. As a policy I am for the United States keeping it agricultural engine online and working as I don't wish my countries food supply to be dependent on, nor easily manipulated or controlled, by others.
[0] https://skeptics.stackexchange.com/questions/39112/does-shel...
The data on wikipedia[1] is from 2004, but I haven't heard of any major reforms since then. From greatest to least, subsidies went to: corn, cotton, wheat, rice, soybeans, dairy, peanuts, sugar, minor oilseeds, tobacco, wool and mohair, vegetable oil products, and honey. Anything else is in the remaining 2%.
[1] https://en.wikipedia.org/wiki/Agricultural_subsidy#United_St...
EDIT: Note that sugar and onward are individually <2% (smaller than the "anything else" bucket)
Your produce would be cheaper in their absence.