I'm gonna look up the cited authors, but my knee jerk response is: Oh please. You can get a first-day undergrad class who've never done conceptual analysis on anything in their lives to agree that knowledge is JTB in about 6 minutes. Knowledge-is-JTB isn't an exotic view.
For his ought-implies-can experiments:
>The results were absolutely clear: commonsense morality implicitly rejects “ought implies can.”
Just glanced at his paper w/Buckwalter, but it strikes me in their experiments they are just asking the wrong questions and thus get results of uncertain importance. I.e., Questions way too complex and loaded than would illuminate anything about commonsense morality. E.g., for experiment 1, they offered this example:
Walter promised that he would pick up Brown from the airport. But on the day of Brown’s flight, Walter is [in a serious car accident/suffering from clinical depression]. As a result, Walter is not [physically/psychologically] able to pick up Brown at the airport.
In the Physical condition, for instance, participants were asked, “Please choose the option that best applies” from the responses below:
- Walter is obligated to pick up Brown at the airport, and Walter is physically able to do so.
- Walter is obligated to pick up Brown at the airport, but Walter is not physically able to do so.
- Walter is not obligated to pick up Brown at the airport, but Walter is physically able to do so.
- Walter is not obligated to pick up Brown at the airport, and Walter is not physically able to do so.
[...] The overwhelming majority of participants judged that Walter is obligated to pick up Brown despite the physical or psychological inability to do so.
If you're going to try to figure out whether people think OIC is a matter of commonsense morality, why not just ask, "Given Walter can't pick up Brown [because of whatever], what should he do?" Or how about this: "If you were with Walter, what would you tell him he should do?"
If they give an answer that isn't "He should pick up Brown" that would suggest that people do take inability into account when asking what people should do, no? Why not follow up with, "Why wouldn't you tell him to pick up Brown?"
If this is characteristic of X-Phi, then it seems to me that experimental philosophers don't understand that determining things about commonsense thinking should involve simple language and simple concepts (like what people use every day), e.g., questions about what people should do when they can't, versus what moral "obligations" they are subject to when they've been inflicted with "inabilities".
The experiment also assumes that moral obligation implies "ought", which as a philosopher I buy as a technical truism, but is probably much more tenuously held as a matter of common sense than OIC.