Physician Matt McCarthy considers it:
I am against capital punishment, but I understand that it’s not going away anytime soon and we must figure out a way to minimize suffering as long as it continues. … A compelling case can be made that based on efficacy, diffusion of responsibility, and inexpensiveness, death by firing squad is a better option [than lethal injection]. (Or perhaps the guillotine.) Some organs would remain intact for donation, and although it might appear grisly, it’s quick, and it is the only method of execution for which we already train people. Interestingly, in states that have offered both shooting and hanging—which also fulfills many of the above criteria—inmates usually opt for the firing squad. One could argue that if properly done, lethal injection would be more humane than either of these methods, but we can no longer expect that it will be properly done.
Previous Dish on the contemporary use of firing squads here.
[Note: the original version of this posted incorrectly suggested that McCarthy was in favor of physicians becoming involved in executions, in order to minimize botched lethal injections.]