[repsilat]

(1) Food producers unilaterally refusing to sell food could be just as disruptive as drug producers refusing to sell drugs. "You can just grow it yourself" isn't a reasonable distinction -- from a practical standpoint most people can't. The reason we don't need to prohibit that behaviour is that the market works.

(2) The government doesn't grow food. Sometimes it pays for it, and sometimes it gives people money so they can pay for it, but there isn't a public option in case farmers decide not to sell us beef, because the market works. (But yeah, the government does -- and should -- help people pay for drugs they can't afford when the prices are reasonable.)

(3) Food production is subsidised, but it shouldn't be. And these subsidies have little bearing on the possibility of extortion in the market.